When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Mine is a little black in there but I wouldn't call it carbon build up... I've seen cars that have the whole rear bumper around the exhaust covered in soot, now that's a problem...
Mine is a little black in there but I wouldn't call it carbon build up... I've seen cars that have the whole rear bumper around the exhaust covered in soot, now that's a problem...
My guess would be that there's some carbon blow-out when starting up from cold, and idling when the fuel mixture is enriched.
I've found that the stuff washes off easily with a soapy sponge during my regular wash routine.
Spridget
I believe it is the same thing....If I wash it then go on a long drive there is not much build up, but if I am continuously cranking it up when I run around town doing errands it builds up much quicker.
I also like your WD40 idea. I am going to try that tonight when I give Rufus a bath.