How many times can I reuse my LC Foam Hybrid pads. I recently used them on a Tahoe (2 weeks ago) and Lexus GX470 (last weekend). I noticed the orange and blue pads are much easier to clean out vs the white pads. The white pads leave behind what I believe is a purple/pink stain from the polish used. Is it ok to reuse this pad? or is there any other method to clean out white pads?