The first step to mold removal is to fix any plumbing leaks that may be leading to the moistness that cultivates mold. You must be able to explore all the plumbing in your home including the pipes in your walls and basement. When repairing pipes and plumbing, it is important not to calk over mold, since that will not kill the mold and your calk may end up peeling, once again movng you away from having better air quality.