Swarfega decking cleaner swarfega swdc5lb p swarfega decking cleaner is a specialist concentrated cleaning chemical for removing the grimy build up found on exterior decking rejuvenating the original look of outdoor wooden flooring p p swarfega decking cleaner has a high strength formula which cuts through grease and grime it is suitable for use on all decking types including wood and timber and restores the original look of tired decking bringing out the natural colour p p the cl