I've got a camera lens kit in my camera bag. Nice brushes, fluffy up to stiff, separately bagged, compressed air, three kinds of wipes, chamois...all this stuff is bagged to keep dust away. Compressed air first, air the brush before during and after, and only after that use anything wet.
Lens caps and camera filters that screw into a scope's threading also apply, I won't buy a scope any more where I can't screw in a filter or at least a short shade tube. Worst case, the muck hits the filter which is way cheaper than the front focusing element. You can dunk the filter in a creek, not so much the scope.
Rear lens isn't quite so critical as the front, but I'm still careful cleaning. Ground glass doesn't like to be scratched.
