If your mop is starting to smell bad, there are a few things you can do to clean it and get rid of the smell. First, try using a vinegar and water solution. Pour 1 cup of white vinegar into a bucket or sink. Add enough cold water to cover the vinegar. Swish the mixture around until it’s mixed well. Wet your mop in the solution and wring out as much water as possible. Let the mop dry completely before using it again. ..