Some basic do's and don'ts:

• when assembling/disassembling your instrument, do not grasp the mechanism to avoid damaging the keywork, and keep the joints parallel. If joints are tight use cork grease (only on corked joints!)
• after playing, clean your instrument's bore with a cloth or pullthrough. It is best to use a plastic or wooden cleaning rod, as metal rods can scratch the bore. If using a metal rod, make sure it is completely covered with the cloth
• if using pad savers, do not leave them inside the instrument, as this will do more harm than good. I find they work best if you put them inside the instrument for up to an hour after playing, with the case open, then remove them
• after playing, it is always best to put your instrument safely back in its case