How to clean a vinyl convertible car roof Begin by vacuuming your soft top and use a brush to remove any loose debris. When this stage is complete, you should completely wet down the top of your convertible car roof Then apply the cleaner evenly on the top and let it sit for around 15 minutes. With a soft bristle brush, use circular movements to gently scrub the top of your convertible car roof, allowing the cleaner to get rid of stains, grime and dirt. Vinyl tops are notorio