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sniderbm t1_j8x63ti wrote on February 17, 2023 at 4:16 PM

Reply to comment by Chiroman88 in Cleaning a thermos bottom from coffee traces "properly". by iBo0m

bb's, the "ball chain" that is used for military dog tags, sand, something that sinks in water, doesn't dissolve, and can provide some scrubbing force against the residue.