By Don Casey
Zippers with metal slides have a bad habit of becoming frozen with corrosion even though the teeth of the zipper are plastic. If you use force, you'll ruin the zipper. Instead, stand the cushion with the zipper up and place a small rag soaked with vinegar over the corroded slide, cover the rag with a piece of Saran, and wait. The acidic vinegar will dissolve the corrosion and free the slide.