Take the wheels off, and with a damp cloth. With a dump cloth, remove dust, mud, hair, and any other kind of garbage (Do not use solvents). Repeat this action, monthly.
Keep the straps and laces in good condition, well adjusted and close to the ankle.
Replace bearings when one of them no longer rotates correctly.
Change the wheels when they are worn.
Before each use, check that the wheel bolts are tight, without forcing them.