Blot the stain with a clean dry cloth to absorb excess liquid
Remove bedding and mattress cover
Mix a small amount of mild dish soap with cold water
Dampen a cloth with the solution and gently dab the stain
Blot with a dry cloth to lift moisture
For urine or sweat stains, sprinkle baking soda over the area and let it sit for several hours
Vacuum the baking soda off the mattress
For tougher stains, apply a mixture of hydrogen peroxide, baking soda, and a small amount of dish soap
Gently scrub with a soft brush or cloth
Blot dry and let the mattress air out completely
Use a fan or open windows to speed drying
Repeat if needed
Avoid soaking the mattress
Test any cleaning solution on a small hidden area first