Things You Will Need
This is because foam mattresses are made from an open-celled structure that allows air to move freely throughout the mattress. This structure also allows liquids or moisture to be absorbed more easily. When cleaning urine from a foam mattress you will need to act immediately to prevent permanent staining.
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Remove blankets and other bedding and wash them using color-safe bleach and normal laundry detergent.
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Blot the mattress with a dry absorbent towel to soak up as much of the urine as possible. Take your mattress outside to your garage or patio near an outside water source, and lean it against a wall or a stable structure, so only the urine stain side is exposed.
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Mix 1/2 cup of vinegar and 1/2 cup of warm water in a spray bottle. Spray the entire urine affected area and let it sit for about three minutes. Vinegar will remove the smell and kill the bacteria in the urine.
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Rinse the area with a garden hose until you're sure all the solution is out. Press the mattress gently to get all of the excess water out.
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Place an electric fan on a high setting near your mattress to help it dry. Make sure your mattress is completely dry before applying any bedding.