Removed mine for the same reason years ago. Noticed wear marks from these not long after I purchased the car. Use a towel as you do now.Probably wearing against your trunk lid. There were two plastic "blocks" with foam pads on them on the trunk lid to push down on the top when it's stored in your trunk. One of mine was missing the foam and had begun to wear on the top. I replaced the foam on both and then one of the blocks fell off completely. I removed the other and began using a black bath towel on top of the roof to prevent wear from the trunk lid. Many here have had custom engraved "blankets" to use for this purpose.