What is period underwear stripping?

Answer

Period underwear stripping is a deep-cleaning method using hot water, borax, washing soda, and detergent to remove accumulated mineral deposits, detergent residue, body oils, and stubborn odors from the absorbent fabrics of period underwear.

The Spruce
Last Updated:June 4, 2026

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Understanding Period Underwear Stripping

Period underwear stripping is a specialized deep-cleaning process designed to revitalize absorbent fabrics by removing built-up residues that regular washing might miss. Specifically for period underwear, this technique targets accumulated detergent, fabric softener, body oils, and mineral deposits from hard water, which can reduce absorbency, trap odors, and lead to a less hygienic feel over time. Unlike a standard wash cycle, stripping involves a prolonged soak in a highly concentrated solution to break down and release these stubborn layers, effectively resetting the fabric's performance and freshness.

Why Stripping is Beneficial for Period Underwear

Over time, even with diligent rinsing and washing, microscopic particles can embed themselves within the multi-layered construction of period underwear. This buildup can diminish the efficacy of the absorbent core, leading to decreased leak protection and a noticeable increase in lingering odors. Hard water minerals exacerbate this problem by binding to fabrics and trapping other residues. Stripping helps restore the underwear's original absorbency and breathability by purging these accumulated substances. It's particularly useful if you notice your underwear feeling less absorbent, appearing dingy, or retaining a faint smell even after a normal wash.

The Science Behind the Soak

Laundry stripping typically employs a combination of three key ingredients: borax, washing soda (sodium carbonate), and a powdered laundry detergent. Borax helps in softening water and boosting detergent performance, while washing soda is a powerful alkaline salt that breaks down fatty acids and oils, acting as a strong cleaning agent. The powdered detergent contributes surfactants to lift dirt and emulsify oils. When these ingredients are combined with very hot water, they create an environment where chemical reactions can occur effectively, dissolving the layers of residue that cling to the fabric fibers. The heat helps to accelerate these reactions and relax the fibers, allowing for deeper penetration and release of trapped grime.

When and How Often to Strip

Period underwear stripping is an intensive process and should not replace your regular washing routine. It is generally recommended to perform this deep clean only when necessary, such as when you observe a noticeable decline in absorbency, persistent odors, or a change in the fabric's feel. For most users, stripping once every few months, or perhaps quarterly, is sufficient. Over-stripping can potentially be harsh on certain fabric blends, especially the delicate absorbent and waterproof layers of period underwear, and may reduce their overall lifespan. Always refer to the manufacturer's care instructions first, as some brands may advise against aggressive cleaning methods to protect their specialized technologies.

Important Considerations and Exceptions

While period underwear stripping can be highly effective, it's not without its caveats and situations where it might not be suitable. Firstly, not all period underwear is designed to withstand the intensity of a stripping treatment. Delicate fabrics like lace, silk, or those with elaborate embellishments may be damaged by the prolonged exposure to hot water and strong chemicals. Always check your garment's specific care label; if it recommends gentle washing or cold water only, stripping might be too harsh.

Secondly, aggressive or frequent stripping could potentially compromise the integrity of the waterproof and absorbent layers of some period underwear. While occasional stripping is unlikely to cause issues, repeated exposure to very hot water and alkaline agents might break down the bonding in these technical fabrics, leading to reduced leak protection over time. If your period underwear uses specific proprietary technologies for absorbency, it’s crucial to verify if stripping is recommended by the brand.

Furthermore, the effectiveness and safety can vary based on your local water hardness and the specific chemical composition of your stripping agents. Over-stripping or using excessively harsh chemicals can also lead to color fading. If you live in an area with extremely hard water, you might need to adjust ratios or consider alternative water softening methods for your regular washes to prevent rapid buildup. Always perform a patch test on an inconspicuous area if you're unsure, or opt for a gentler deep-cleaning method if you have concerns about damaging your underwear.

Steps for Deep Cleaning Your Period Underwear

  1. Prepare and Pre-Rinse Your Underwear: Before stripping, ensure your period underwear is already clean from visible menstrual blood and has undergone at least one normal wash cycle. Rinse out any remaining discharge or blood under cold water until it runs clear, then machine wash on a regular cycle using your usual detergent to remove surface dirt and fresh stains.

  2. Create the Stripping Solution: Fill a bathtub, large basin, or bucket with very hot water, ideally the hottest your tap can provide. Add your stripping ingredients in the following approximate ratio for a full bathtub: 1/4 cup borax, 1/4 cup washing soda (sodium carbonate), and a small amount (e.g., 1/2 capful) of your regular powdered laundry detergent. Stir well until all powders are fully dissolved.

  3. Submerge and Soak Thoroughly: Carefully add your pre-washed period underwear to the hot stripping solution, ensuring they are fully submerged. Use a utensil or gloved hands to agitate them gently and ensure all trapped air escapes. Allow the underwear to soak for at least 4-6 hours, or even overnight, until the water has cooled completely and appears murky brown with released residues.

  4. Drain, Rinse, and Rewash: Once the soaking is complete, carefully drain the dirty, murky water. Do not wring or twist the underwear harshly. Rinse the underwear thoroughly under running water until all soapiness and discoloration are gone. Then, immediately run the stripped underwear through a full, normal wash cycle in your washing machine without any additional detergent or fabric softener to ensure all residues are completely flushed out.

  5. Air Dry and Inspect: After the final wash, remove the period underwear from the washing machine. Avoid using a tumble dryer, as high heat can damage the elastic and waterproof layers. Instead, air dry the underwear completely by hanging them or laying them flat. Once dry, inspect them for improved absorbency, reduced odors, and overall freshness to confirm the stripping process was successful.

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