Question: How to Clean Soiled Mattresses?
How to clean mattresses that have been peed on by children? I don’t want to go buy new ones because I just bought the brand new ones like 6 months ago!
Answer: The best way is perhaps to keep a waterproof mattress cover or mattress pad on every mattress including your own bed since children like to crawl into bed with you at night.
Before you put on a waterproof mattress cover or mattress pad, make sure you soak up as much excess urine as possible until the the urine stain is dry.
Next, apply 3% liquid hydrogen peroxide on the stained area. Leave it on for five minutes. Repeat the step above.
Then, apply bicarbonate of soda or baking soda on the mattress and rub it in gently with a soft brush or firm sponge. Leave it on overnight. Vacuum off the dry powder the next day.
Lastly, dry the mattress in hot sun for a day before putting on a waterproof mattress cover or mattress pad.
Your tips/suggestions are welcome. 
{ 3 comments… read them below or add one }
You can try soaking the areas with vinegar or peroxide then rubbing. Afterward set the child’s mattress out in the sun to ventilate and help it dry out. It sounds as if you need to put a rubber sheet on the bed to prevent urine from soaking through.
recommendation to rent a steamer from anywhere, then let it dry and spray with disinfecting spray
the same way you would clean chairs and couches.use a carpet cleaner that has nozzels on it and a long hose and clean it the same way. after you clean it then spray it with a protective coating that will guard against further stains.