It's a very alkaline stuff that helps to set the pH of the cosmetic formula to be just right. It's similar to the more often used sodium hydroxide and pretty much the same of what we wrote there applies here too.
Products with Potassium Hydroxide
Equate Oil-Free Acne Scrub SNP Prep Cicaronic Mild Cleansing Foam The Face Shop Rice Water Bright Cleansing Foam Sally Hansen Instant Cuticle Remover™ 3W Clinic Snail Cleansing Foam 3W Clinic Snail Foam Cleansing Actigener Lotion BIO HEAL BOH Panthenol Cica Barrier Anti-dust Amino Cleanser Babushka Agafia Recipes Of Babushka Agafia Buckwheat Body Scrub Bathing Culture Mind And Body Wash Biore Body Foam Active Antibacterial Biore Body Foam Pure Mild Budgie Tingle-bell Exfoliating Face Mask DRX Series Skin Perfection Wipe Deodore Shower Cream Anti-oxidant Derma E Vitamin C 10% Multi-acid Radiance Liquid Peel Derma Natufian AHA, BHA Peeling Perfect Solution Dr Bronner Rose Pure-Castile Liquid Soap Dr. Bronner's 18 In 1 Hemp Tea Tree Pure-Castile Soap Dr. Bronner's 18 In 1 Natural Tea Tree Soap Dr. Bronner's Almond Liquid Soap Dr. Bronner's Hemp Peppermint Pure Castile Soap Dr. Bronner's Pure-Castile Liquid Soap- Baby Unscented Dr. Douxi 18% Mandelic Acid Dr. Jart+ V7 Cleansing Foam Dr. Melaxin TX Ampoule Cleanser Eco Style Professional Styling Gel Coconut Oil Ecooking Peeling Mask Ecooking Peeling Mask Elizavecca 24K Gold Snail Foam Cleasing Elizavecca Milky Piggy, 24K Gold Snail Foam Cleansing Essence Cuticle Remover FUKU Brightening Face Serum With Niacinamide 10% And Vitamin A, C & E FarmStay Olive Intensive Moisture Foam Cleanser HELLOSKIN Jumiso Yes I Am Toner AHA 5% Insta Natural Glycolic Acid Facial Peel With Vitamin C Isana Sea Moments Enthaarungs-Gel Keve Vitamin C 20% Serum KimChi Chic Beauty Rice Rice Baby Effin Clean Foaming Face Cleanser Lacoco Ultimate Golden Swallow Facial Foam Lumin Anti-Wrinkle Serum Marlowe No. 141 Shave Cream Matte Balancing AHA Facial Cleanser Mizon AHA 8% Peeling Serum Mizon Acence Anti Blemish Foam Cleanser Monat Exfoliating Peel Pads Nabulsi Natural Body Wash With Olive Oil & Hyacinth Natur planet Beldi Black Soap Noire Skin Botanicals Honey Facial Cleanser Nécessaire The Deodorant Gel