Waterproof shelf liners are a great way to keep mildew and water damage out of your drawers. You can pick them up from almost any store and cut them to fit perfectly in the drawer of your choice.  In addition, some shelf liners are made out of decorative paper so that you can customize and match them to your home’s decor. Shelf liners are a simple, easy way to protect your drawers. They’re also inexpensive and require virtually no technical expertise.