removing mold from memory foam mattresses?

Me and my Husband used to run a humidifier in our room until recently. We turned over our mattress which is memory foam and it had mold all over the bottom! I need help on how to get rid of it, the covering around it has been covered in mold also, i washed the covering but it seems to be stained badly. Please help. Many people say to sit everything in the sun outside but I live in a small apartment in Japan we have no where to lay the mattress in the sun.

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