Liquid Pot Washer Detergent. Topmatic Alu is specially formulated to be used as a liquid detergent to wash aluminium pots and utensils in industrial pot washers. Topmatic Alu is an extremely strong detergent with added surfactants and inhibitors that prevent damage and wear to aluminium pots and pans. Other caustic base detergents can corrode the soft metal pots and pans and therefore contaminate the food.