The RACORS were pretty grungy in the bowl. Filters themselves weren't too bad, and vacuum did not show a problem. Still decided to take them apart, clean them and put a new filter in. Bought an oil change tub at Wallymart. Drain the RACOR into a small bowl and dump in the basin, it drains into the can. Save some to clean bits with..... It all drains away. Very handy.