So I was using mcguires(sp) plastic and rubber cleaner/protectant and I can't seem to get the armrest clean. I'm worried about using too much product on it as I don't want a buildup of Goo or stuff in there. I assume it is just a plastic but it seems very difficult to clean. I was thinking of using an old brush or something instead of microfiber towels. Can anyone recommend a product and method for cleaning it?