I've never waxed a tractor, but I do rinse it off every once in awhile. And after mowing, I either rinse the mower off with water, or blow the dust and dirt off with the air hose.
Chip, what you see in the upper right corner of the canopy is my rear view mirror from Northern Tool. I know most folks are probably accustomed to having the mirror on the left, but since I get on and off most frequently on the left side, I didn't want to chance bumping my head on it. It works quite well on the right.
Bird