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Dear Samwichse
I come from a family of Plumbers, and couldn't wait to jump on this... but Surreal beat me to it! And her advice is correct: no steel wool!!
You CAN use a single-edge razor (CAREFULLY) on the resin composite, just keep the back of the blade DOWN. After that, you might also consider a store bought compound called CLR, removes Calcium, Lime, Rust, pretty well.
Are you replacing the stems, or rebuilding them?
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