M.S.
If t's just mustiness, try wiping the inside cabinet under the sink with vinegar or a mixture of vinegar and water. Vinegar is a clean smell and is great at taking care of odors. Vinegar doesn't mask odors, it actually removes them.
If that fails, then there may be some left over mold that wasn't taken are of initially and you may need to take things out again and find the cause of the remaining mold. Because, the things, if there is mold, nothing can fixit, except to gt rid of the source of the mold.