re: How often do you clean your guns?

Like others have said, it depends on the gun and it's use.
Deer rifles/handguns/shotguns: Clean bore at the end of the season.
Varmint rifles/handguns: These guns get shot more so they get cleaned more often. Usually clean them when accuracy starts to drop off. OTOH, on a prairie dog hunting trip I'll clean the bore w/ "Wipe Out" at night after the days shoot.
22 LR: Bore/action get cleaned if accuracy or function deteriorate.
Carry handguns: Clean the bore after each shoot. Wipe down the exterior every few weeks.

All hunting guns get the exterior wiped down after exposure to bad weather.

ETA: When cleaning a rifle or handgun, do yourself a big favor and use a proper fitting bore guide and single piece cleaning rod. Prolly more guns have been ruined by having the bore cleaned by well-meaning, but poorly equipped, gun owners.