Stannol ammonium chloride soldering iron copper tip cleaners stannol 907076 stannol ammonium chloride bricks are ideal for cleaning copper soldering iron tips simply rub the hot soldering iron tip on the block to release the acidic cleaner which dissolves any unwanted corrosion stannol 907076 ammonium chloride solder brick tip cleaner 100 x 45 x 20mm