A sudsy sponge at the bottom of a wet sink
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The Best Way To Store Your Sponges To Keep Them From Smelling
By MICHELE WANKE
Dirty, wet sponges can develop dangerous bacteria that lead to foul odors. To prevent this, keep them in a dry spot with good air circulation when they're not in use.
Closed spaces limit air circulation, which may cause germs on the sponge and create a foul smell. Avoid storing sponges in a bucket under a sink or in a cupboard above the sink.
After using your sponge, clean it and wring it out so excess moisture doesn't cause bacterial growth on the sponge. Then, find a dry, airy storage area.
Laying a moist sponge on a countertop or at the bottom of a damp sink will increase the time it will take to dry, which may lead to odorous bacteria.
To prevent reeking bacteria from developing on your sponge, store it in a plastic basket or a drying rack with drain holes at the bottom.
Another option for your sponges is to create a DIY sponge holder by attaching a sieve to the back of your sink or draining rack.