Replacement sponge for the Weller WLC 100 soldering station ( S-TWLC100 ) and others. Keep your iron tip clean using this genuine Weller replacement sponge. Cleaning a hot soldering iron on a damp sponge causes the solder to contract at a contrasting rate to the soldering iron, helping to remove any solder stuck to the tip. Always be sure the sponge is merely damp rather than soaked in water.