I have a 10-yr old whirlpool tub with "****" jets and jet covers, overflow values, etc. The "****" has become tarnished and ugly and needs to be replaced. Does anyone have an idea how I can at least take the jet covers off and replace them? I can't find the manufacturer of the tub itself (it's a 2-pc molded unit, not a "stand-alone" drop-in piece.) but the water faucets are by Delta.