Report dry/damaged fingernails after working with clay in Studio Operations and Making Work Posted September 19, 2012 Clay is alkali; rubbing vinegar into your hands after throwing neutralizes and balances your skin's PH level. Olive oil is an excellent moisturizer. I put 50/50 vinegar and oil in a squirt bottle, shake it up and apply it after every throwing session. Wonderful stuff. There is also a product by Shiseido called Hadasui Skin and Body Lotion that you can get at TNT Market - a Chinese grocery chain, or stores carrying Japanese products.