Originally Posted by Mike-in-Orange

The most common product for cloth top car is the cleaner and protectant made by Ragg Topp.

Seeing as I work for Meguiar's I feel the need to recommend an alternative though: from our Marine & RV Line I'd recommend our M71 Canvas Cleaner and M72 Canvas Protectant. Both are designed for canvas biminis on boats that sit outside in the blazing all day, year 'round. It's great stuff and priced slightly below Ragg Topp (but close enough to call it even). If you have a West Marine near you they may carry it.