Why Does My Bar Soap Make My Skin Feel Sticky?
Have you ever hopped out of a nice, relaxing shower only to find your skin feels weirdly sticky and filmy? I know I have many times!
As an expert in home renovation and DIY projects, I‘ve done a lot of research on bath and body products. So I wanted to get to the bottom of this pesky bar soap residue issue.
In this guide, we‘ll uncover:
Let‘s lather up on the facts!
What Ingredients In Bar Soap Cause It To Feel Sticky?
There are a few sneaky ingredients used in some bar soaps that can leave your skin feeling more slimy than squeaky clean:
Oils
Most bar soaps contain oils like coconut, palm, olive or almond oil to help moisturize and condition your skin as you wash. But leaving too much of these oils on your skin can lead to a definite sticky feeling.
According to a study in the National Library of Medicine, coconut oil in particular can leave an oily residue and clog pores for some skin types.
Animal Fats
Some traditional bars use animal fats like tallow (beef fat) or lard (pig fat) as a base ingredient. Animal-derived soaps tend to have a thicker, more waxy feeling that can transfer to your skin. A 2006 study found tallow-based soaps leave a significant fatty residue compared to vegetable-based bars.
Fragrance Oils
Scented bar soaps often contain synthetic fragrance oils to provide that delicious aroma. But these added perfumes can leave an oily residue behind. According to dermatologist Dr. Marie Jhin, these synthetic fragrances are common irritants.
Glycerin
Glycerin is added to many bars as a humectant to draw moisture into your skin. But too much glycerin left on your skin without rinsing can lead to a tacky, sticky feeling.
According to 2017 research, glycerin residues can also promote the growth of bacteria on bar soap during use.
Harsh Detergents
Some bars contain strong detergents like sodium lauryl sulfate to make the soap more foamy. But these sudsers can also strip your skin of its natural oils, causing dryness and stickiness.
Does The Soap Making Process Affect Stickiness?
It‘s not just the ingredients that determine the amount of residue. The actual soap making process plays a role as well.
Cold Process Soap
One popular method is cold process soap making. This involves combining oils, butters, and sodium hydroxide lye without external heat. The soap then has to cure for 4-6 weeks to fully harden before use.
But if you use cold process soap too soon, it can still have a slimy, tacky texture that leads to residue. Patience is a virtue with cold process!
According to master soapmaker Anne-Marie Faiola, cold process soap should cure for a minimum of 4 weeks before use for the best lather and skin feel.
Lye Concentration
The amount of sodium hydroxide lye used in soap making also affects the final product. Too much lye can leave soap with a high pH outside the ideal range.
According to Chemical Engineer Dr. Kevin Dunn, lye should be around 8-9% of your total oil/butter weight. Excess lye may not fully react, leaving residue behind.
Insufficient Mixing
Thoroughly mixing the soap ingredients ensures that the oils, butters and lye solution fully react in a process called saponification. But insufficient mixing can leave pockets of oils that create stickiness.
Mixing for at least 30-60 minutes after adding lye is ideal for bar soap, advises handmade soap artisan reliefsoaps.com.
Superfatting
Some soap makers intentionally use a "superfat" technique, where they add extra oils to create a more moisturizing bar. But too high of a superfat percentage can leave excess oils on your skin.
The ideal superfat level is 3-8%, according to Kelsie of Modern Soapmaking. Too much can lead to a soft, oily bar and residue.
How To Choose A Bar Soap That Won‘t Leave A Residue
Now that we know the root causes of sticky soap, let‘s talk about how to pick the right bar to avoid residue. Here are my top tips:
Seek Out Plant-Derived Ingredients
Choose bars made primarily with gentle, plant-based oils high in linoleic acid like safflower or sunflower oil. These are less likely to clog pores or feel heavy.
Bars made with plant-derived glycerin are great, just avoid excess amounts. And opt for vegetable or organic butter bases when possible.
Avoid Added Synthetic Fragrances
Steer clear of bar soaps with added perfumes, which tend to use synthetic fragrance oils. Stick to unscented bars or ones scented with only pure essential oils.
The Environmental Working Group recommends fragrance-free bar soaps as the safest option for sensitive skin.
Pick Fully Cured Cold Process Bars
When buying handmade cold process soap, check that it has cured a full 4-6 weeks after being made. This allows time for the soap to harden and lowers the risk of residue.
Or look for hot process soap instead, which is cooked after adding lye so it can be used more quickly.
Select Solids Over Milled Soaps
Milled soaps have added glycerin and moisturizers to create a richer lather and smoother texture. But these extra moisturizing ingredients make them more prone to residue.
Traditional harder vegetable or olive oil-based bars are less likely to feel sticky. Or look for "vegan" on labels to avoid animal fats.
Pro Tips: Using & Storing Bar Soap Right
Aside from choosing the right soap, it‘s also key to use and store your bar properly to avoid that dreaded sticky film.
Here are my top bar soap usage tips:
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Rinse thoroughly: Take the time to rinse all soap residue off your skin with warm water for up to 30 seconds.
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Let it dry: Allow bar to dry fully between uses to discourage bacterial growth. Never let it sit in a pooled puddle of water.
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Ventilate storage: Keep bar in an open draining soap dish that allows airflow underneath and around the sides.
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Replace frequently: Throw away bars after 3-4 weeks of use when they start to get overly soft or worn down.
Proper usage and storage helps minimize excess oils and residue on your bar – and your skin.
How Does Bar Soap Residue Compare To Body Wash?
You might be wondering if you‘re better off switching to body wash or shower gel to avoid any residue on your skin after cleansing.
The good news is there are great options for residue-free body washes too. But some things to watch out for:
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Oil-rich formulas: Avoid body washes with heavy moisturizing oils, butters or petroleum that can feel greasy.
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Harsh sulfates: Sodium lauryl sulfate (SLS) is a common culprit for drying out skin and causing stickiness.
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Thick consistency: The thicker a body wash, the more rinsing may be required to avoid residue.
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Added fragrances: Synthetic perfumes often contain oily phthalates best avoided.
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Insufficient rinsing: As with bar soap, take the time to rinse thoroughly and avoid residue.
Light, gel-based washes are ideal. But no matter what you use, rinse rinse rinse!
What Dermatologists Say About Bar Soap Ingredient
Many dermatologists actually caution against using bar soap, especially on sensitive or acne-prone skin. The main concerns are around bacteria.
According to dermatologist Dr. Rita Linkner, "Bar soaps can harbor bacteria, mold and fungi, thus transferring to your skin and potentially causing breakouts or rashes."
For this reason, many dermatologists recommend gentle, fragrance-free liquid cleansers instead.
However, when selecting a bar soap, dermatologists advise choosing one with skin-nourishing ingredients like glycerin, plant oils and butters. A neutral pH around 7 is ideal.
Is Sticky Residue From Soap Harmful?
While sticky residue from bar soap or body wash might be unpleasant or annoying, rest assured it is generally not considered toxic or dangerous in any way.
The biggest risk is potential skin irritation, clogged pores, or transferring bacteria back to the bar which can then spread.
As long as you rinse thoroughly and stick to mild, fragrance-free soaps, your health is not at risk. Discontinue use of any soap that causes severe irritation or reactions.
By learning what causes residue and how to prevent it, you can safely enjoy the sensory pleasure of a nice bar soap without the worry of stepping out of the shower feeling sticky!
I hope this guide gave you some helpful insight into tackling thesticky residue problem. Let me know if you have any other lingering questions!