Pontiac GTO 2004-2006 - Plugs/caps in rear wheel wells are for what? Picture inside....

Both cars are pictured here but on my 05 goat and wifes 325i bimmer what are those plugs/caps that are in the wheel wells of the rear tire? Click pictures to make bigger. Thanks

http://imageupload.org/dm-312987027935.png

http://imageupload.org/dm-512987027933.png

thats an acsess hole to allow you to be able to clean out mud and debris that get caught inside the fender. the first time i removed mine to clean in there it was full of crap that would eventually start rust if not cleaned out.

Thats good to know.I guess I might need to clean mine

damn, i never knew about that. thanks.