Have your chimney flashing (the seal between the chimney and the roof) inspected and maintained. Flashing prevents rain water and snow melt from entering your home and causing costly damage to your walls and ceilings.
For cleaning accumulated sawdust and wood resins from tools, use warm soapy water with a stiff scrub brush. If resin is a problem, you can try a solution of ammonia and warm water, but only soak parts in the solution a short time since it can cause them to rust. For grease or oil, soak parts in a good safety solvent.