I was worried about over tightening the wheel bolts in the dropouts.

I'm due for a clean and lube anyway, last weekend thrashed it hard with all that lovely rain gunk. Good to know re: milage, maybe I need to clean/lube each week as well - I wasn't that diligent with my roadie, perhaps I ought to be.

I have the MEC chain cleaning thing and their bio-cleaner stuff, for the fixie I'll remove the chain and pop it into an old bottle with the chain cleaning fluid, then go at it with a toothbrush. When I leave the chain on a bike, it usually gets a dose of soap and water after the chain cleaner as well. I use Triflow for lube, too. I've found this cleaner and fluid works really well for me, bear in mind I pretty much only stay on the streets, there's rarely any offroad grime for me to deal with.