No need to go to the dealer to clean the clutch plate. Just grab your favorite degreaser and spray it into the air gap between the clutch plate and the driven plate. Let soak, and hose off. I used Simple Green - I always have a big spray bottle handy in the garage 'cause I'm always getting something dirty.

Adjusting the air gap is quite easy, but significantly more involved. It requires a simple, but specialized tool. My local Mcparts place lends them for free. Simply remove the 12mm nut which retains the clutch plate and thread in the body of the remover tool. Then screw in the big bolt part of the remover and it pushes the plate right off. In theory it's simple - the hard part is that there is insufficient clearance between the compressor and radiator for the tool, so the radiator has to be pulled to make room!

The actual air gap is adjusted via spacer washers on the compressor drive shaft. It becomes obvious once you remove the clutch plate. There are usually two washers, so you can just remove one of them to close the gap up to specification. Of course, measure the gap with your feeler guages before taking it all apart...