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Listen and look for the leak in the air mattress. Use soap and water if you can’t find the leak. Mark the leak with a permanent marker.

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If you don’t know where the hole is, keep the air mattress inflated as you look. Holes most often appear on the bottom or in the seams, so stand the mattress up against a wall to check. Listen for the sound of rushing air to detect tiny leaks. Try mixing a teaspoon of liquid dish detergent in a bowl of water. Use a sponge to spread the soapy water over the mattress. Bubbles will appear from the leaking area. Circle the leak with the marker so you can find it easily later. This is useful for small holes and tears. You can also use a piece of tape to mark the leak.