I've used steel wool. I just stuck some into the opening then used my finger to swipe it around the threads a bit. It worked pretty well. I didn't over work it so it would leave pieces of steel wool in the tank. Just a few good swipes then a new piece.
That and new plumbers tape and it hasn't leaked yet.
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Jeff & Sandi (and Teddy - 7lb Schnorkie)
2018 Montana HC 305RL / HW Progressive EMS
2015 RAM 3500 Laramie Longhorn Crew Cab 4x4 DRW / Demco Recon Hitch on RAM Puck Ball
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