I bought new tires a few months ago and all I have ever put on them is VRT. I clean them with adams APC every time I wash the truck but I can not seem to get the old VRT dressing build up on. I do not put excessive amouts of VRT on when I do the tires. Any ideas what I can do to strip the old dressing to get them clean again? I use full strength APC and adams tire brush. Any help would be great! Thanks