How to clean sweat and urine stains from a mattress with just 3 ingredients. This really worked, I thought my mattress was ruined, then I tried this and it looks clean again. Not brand new, but like new, for sure! 8 oz hydrogen peroxide, 3 tbs baking soda, 1 drop dish soap. *not my photo- from Rudyfamilyruckus.com* http://www.rudyfamilyrukus.com/2013/02/how-to-get-urinesweat-stains-out-of.html