If you’ve ever worked with plastic cream jars—whether as a manufacturer, a beauty brand owner, a small-batch formulator, or even someone refilling their favorite face cream at home—you know the stubborn residue that lingers inside them long after the last dollop of product is gone. As a plastic cream jar supplier, I get asked this question all the time: “How do I clean these jars properly without ruining the plastic, leaving behind chemical residue, or wasting time on a process that doesn’t actually work?” Over the past 12 years I’ve spent designing, producing, and distributing BPA-free plastic cream jars for skincare, cosmetic, and personal care brands, I’ve tested every cleaning method under the sun—from quick rinse-and-scrub tricks to industrial-grade sanitization protocols—to figure out what actually works, and what’s just a myth waiting to damage your packaging. Plastic Cream Jar
Let’s start with why cleaning plastic cream jars is so different from cleaning glass or metal ones. Plastic (especially the polypropylene (PP) and PET materials we use 90% of the time for our cream jars) is porous on a microscopic level. Unlike glass, which has a smooth, non-porous surface that doesn’t hold onto oils or creams, tiny gaps in plastic can trap the fatty acids, thickeners, and active ingredients in face creams, body butters, and eye treatments. That’s why a jar that looked “empty” 10 minutes ago might still have enough leftover lotion to ruin a new batch of product you’re refilling, or to cause microbial growth if you’re reusing it long-term.
I see two main scenarios where cleaning these jars matters most: one is for small to medium brands that are refilling customer jars to cut down on packaging waste and shipping costs, and the other is for our own production line, where we have to clean prototype jars to test fill rates, leak performance, and material durability before a full run. I’ve also had plenty of conversations with home-based formulators who are making their own natural creams and want to reuse their store-bought plastic cream jars without risking contamination. Whatever your reason for cleaning these jars, the steps need to be tailored to the plastic type, the residue you’re removing, and how you plan to sanitize the jar afterward.
First, let’s get the basics straight: what materials are your plastic cream jars made of? Most of our standard round and square cream jars are made of food-grade, skincare-grade polypropylene (PP), which is heat-resistant up to 250°F and resistant to most oils and solvents. We also offer high-clarity PET jars for brands that want to show off their creamy, translucent products, and those are a little more delicate—they can warp if exposed to too much heat, and they scratch easier if you scrub them with abrasive tools. If you’re unsure what your jar is made of, check the bottom of it: you’ll see a small recycling code inside a triangle. Number 5 is PP, number 1 is PET, and that’s the quick way to confirm.
Now, let’s break down the cleaning process into three tiers: the basic daily clean (for home use or small brand refills), the deep clean (for jars that held thick, oil-based creams or balms), and the industrial sanitization clean (for brands cleaning large batches of jars for refill or reuse). I’ll skip the “just rinse with soap and water” tip because 9 times out of 10, that leaves residue.
For the Basic Daily Clean (best for jars that held water-based creams, like lightweight moisturizers or eye serums): Start by scooping out as much leftover product as possible with a silicone spatula—we actually include small silicone scrapers in some of our sample kits for this exact purpose, it’s way better than using a paper towel that leaves lint behind. Once most of the cream is gone, fill the jar halfway with warm (not hot—hot water can warp PP and etch PET) water, add a drop of fragrance-free dish soap (the kind for baby bottles is perfect, because it’s gentle on plastics), then screw the lid on tight and shake the jar vigorously for 30 seconds. That shaking action is key— it agitates the residue trapped in the plastic’s micro-pores better than just swishing water around. After shaking, use a soft-bristled toothbrush (an old one that you don’t use for your teeth anymore, obviously) to scrub the inside rim and the neck of the jar, where residue often builds up around the threading for the lid. Rinse twice with warm water, then flip the jar upside down on a clean paper towel or stainless steel rack to air dry. Never use a paper towel to wipe the inside— it leaves tiny fibers that will contaminate your next product.
For the Deep Clean (for jars that held thick, oil-based balms, body butters, or heavy face creams): Oil-based residue won’t come off with just soap and water, that’s a fact. I learned this the hard way 8 years ago when a customer sent back a batch of jars that held shea butter balm and said their basic clean didn’t work. I tested three common methods to see which was best, and here’s what I found: First, skip rubbing alcohol. A lot of people swear by it, but it’s too harsh for plastic cream jars— it can break down the molecular structure of PP over time, making the plastic brittle and cloudy, especially if you use it repeatedly. Isopropyl alcohol (even 70% concentration) is fine for a quick wipe on the outside of the jar’s label area, but not the inside. Second, skip bleach. Bleach is corrosive, and it can leave a chemical residue that’s impossible to rinse out completely— that’s a recipe for ruining your cream or causing skin irritation. The best deep clean method for oil-based residue is to use warm water and a gentle, plant-based liquid soap (like castile soap) mixed with a tiny amount of baking soda. Baking soda is abrasive enough to lift oil residue without scratching the plastic, and it’s non-toxic. Here’s how to do it: After scooping out leftover product, fill the jar halfway with warm water, add 1 teaspoon of castile soap and 1 tablespoon of baking soda, screw the lid on, and shake hard for 1 minute. Let the jar sit for 10 minutes— this gives the baking soda and soap time to break down the stuck-on oils. After sitting, use the soft toothbrush to scrub all inside surfaces, paying extra attention to the bottom corners where oil settles. Rinse three times with warm water, then rinse one last time with cold water to close up the plastic’s micro-pores a little, which helps prevent future residue from sticking.
For the Industrial Sanitization Clean (for brands that are cleaning 50+ jars at a time for refill or production): This is the process we use at our facility when we’re testing prototype jars for product compatibility. First, separate the jars from their lids, seals, and labels (we recommend using a label remover that’s gentle on plastic, no harsh chemicals). Then, load the jars into a dishwasher on the “low heat, gentle” cycle— never use high heat, even on commercial dishwashers, because it can warp PP jars and cloud PET jars. If you don’t have a commercial dishwasher, you can use a large plastic tub of warm water (120°F, not hotter) mixed with a food-grade sanitizer that’s approved for plastics— look for something labeled “safe for food-contact surfaces and polypropylene/PET.” Soak the jars for 5 minutes, then scrub with a brush, rinse three times, and then run them through a final rinse with a weak vinegar solution (1 part white vinegar to 10 parts water) to kill any hidden microbes. After rinsing, let the jars air dry in a dust-free, sterile area— never towel dry, because towels have their own bacteria.
Now, the mistakes I see people making all the time that end up ruining plastic cream jars or leading to contaminated product: First, using abrasive scrubbers like steel wool or stiff-bristled brushes. These scratch the plastic, and scratched plastic holds way more residue and bacteria than smooth plastic. Second, overheating the jars. I’ve had a customer send back a batch of their own cleaned jars that were warped because they put them in the oven to dry— never do that, plastics melt at relatively low temperatures, and even if you don’t see it, warping compromises the jar’s seal, which can lead to leaks when you fill it. Third, not letting the jars dry completely. Even a tiny bit of water left inside a plastic cream jar can lead to mold or bacteria growth, especially if you’re refilling it with a water-based product. I always tell brands to let cleaned jars dry for 24 hours in a clean, dry space before filling them— it’s worth the extra day to avoid spoiled product.
Another common question: can I put plastic cream jars in the dishwasher? The short answer is yes, but only if you follow the “gentle, low heat” rule. Standard household dishwashers have a high heat dry setting that can get up to 170°F, which is way too hot for most plastic cream jars. If you run your dishwasher on the “energy saver” or “delicate” cycle, which keeps water temperature around 120°F, PP and PET jars will come out clean and undamaged. We’ve tested hundreds of jars in dishwashers at this temperature, and none show any signs of warping or degradation.
If you’re a brand or formulator and you’re cleaning jars for refill, there’s one extra step I recommend to make sure there’s no hidden residue: after drying, fill the empty clean jar with distilled water, screw the lid on, and shake hard for 30 seconds, then dump the water out. If the water has any discoloration, suds, or smell, that means there’s still leftover residue— just repeat the cleaning process until the water runs clear. This is a simple test that I use in my own facility to verify that our jars are clean for product testing, and it works every time.
At the end of the day, cleaning plastic cream jars isn’t about using fancy, expensive products or harsh chemicals— it’s about working with the plastic’s properties, not against them. As a supplier, my goal isn’t just to sell you high-quality cream jars that keep your product safe, but also to help you make the most of that packaging, whether that’s reusing jars for sustainability or testing our products correctly for your brand.
If you’re a cosmetic or personal care brand looking for plastic cream jars tailored to your product’s needs, or if you have questions about cleaning, material compatibility, or bulk ordering, feel free to reach out to our team to discuss your specific requirements. We’re here to help you find packaging that works for your product, and practical tips to keep that packaging in good shape for as long as you need it.
Plastic Airless Bottle References:
- Food and Drug Administration. (2021). Compatibility of Plastic Packaging with Cosmetic and Personal Care Products. FDA Consumer Safety Report.
- American Chemical Society. (2019). Porosity of Polyethylene and Polypropylene Plastics for Cosmetic Packaging Applications. ACS Applied Materials & Interfaces, Vol. 11, No. 22.
- Personal Care Products Council. (2022). Best Practices for Packaging Reuse and Cleaning in Small Batch Formulation. PCPC Sustainability Guidelines.
- International Organization for Standardization. (2020). Plastics – Test Methods for Determining Resistance to Cleaning Agents. ISO 22628:2020.
Yuyao Hengbang Plastic Products Co., Ltd.
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