Mix 8 ounces of hydrogen peroxide with 3 tbsps of baking soda and a drop of dish soap, then place in spray bottle. Spray and rub into mattress stain with a cloth. You will be surprised how quickly the stains disappear.
Mattress Cleaning Tips: Get sweat stains out of your mattress - awesome because i paid a fortune for my awesome pillowtop just 2 years ago, and it looks like a child has been sleeping on it for ten years. apparently im a sweaty sleeper.
Sprinkle baking soda over your entire mattress, let it sit for few minutes before vacuuming to get rid of any smells. Next, you will want to use a mixture of peroxide, dish soap and salt to get rid of stains from blood, sweat and urine.
All menstruating women need to know how to get blood stains out! After you use the cornstarch/salt/water blend (I didn't have peroxide) then just mist water onto the mattress and soak it up with paper towels. Worked like magic!