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Soldering Iron Sponge Yellow Universal 5cm x 3cm
The sponge is porous, so it holds water.
Rubbing a hot soldering iron tip on a wet sponge causes the solder to contract at a different rate than the soldering iron, helping to knock off any globs of solder that may be clinging to the tip.
NOTE: Make sure the sponge is damp (not soaked) with water.