There's nothing I hate more than mold that slowly starts to grow in the caulking of a shower. I'm a clean freak and religiously clean the entire condo, especially the bathroom, at least once per week. I even use a toothbrush on the caulking to prevent mold but to no avail. Water still seems to find it's way in there or behind there and creates mold. How can I prevent this or better yet, get rid of what's already started to grow? Am I doomed to re-caulking every few years?