I'd be careful with the compressed air as it comes out at sub-zero temps and could cause a physical reaction in the strings where they are stressed bending over the saddles. Not likely but could make them brittle, also might not be great on the finish as well.
Personally, I just clean the bridge and everything else when I do a string change using a microfiber cloth. You can also use one of those mini-vacs used to clean out computer keyboards as well on the bridge and other tight spaces if you don't want to change the strings.
i've done the microfiber, but it doesn't get into some of the tighter spaces. i may give the mini-vac thing a try though. thanks for the input
