When professionals remove mold they will generally do so with a contractor grade cleaning solution that has been specifically made to tackle mold. Many of these products are available online but they are fairly expensive which does add extra cost to your painting process. For small jobs, there is a range of household products which can do a great job as we've already mentioned. Professionals can be a good choice for a particularly bad outbreak of mold but in most circumstances, you can easily do the work yourself.