My mattress had several stains, I'm sure they were a combination of drool, urine, beverages, baby spit up- you name it. Anyhow, this method really worked well. I had one pretty dark stain that I sprayed again later with a new mixture. I am amazed..
Several DIY Household cleaner recipes, including Blessing in a Bottle - also known as "kitchen Magic" This stuff will get through anything, make your sink and shower shine like new, and save you when just about nothing else works.