I've used WD40 for a couple years now with a brake cleaning gun that mechanics use to clean off brakes. Fill the can half full of WD40 and pressure it up to 100 lbs of air and works great !!. after that I blow it off with the air gun and wipe off any excess with a rag.. as far as attracting dirt, yes it does, but the dirt/ mud don't stick to the truck as bad, making for an easy clean after the next race. I too think it works as a conditioner on the plastics as it is an oil based product..