VIPER HEAVY DUTY IS A CONCENTRATED VERSION OF OUR POPULAR VIPER AEROSOL PRODUCT. USE VIPER HD INSTEAD OF A HAZARDOUS ACID OR ALKALINE CLEANER FOR UNBELIEVABLE PERFORMANCE. VIPER HD IS A MULTIPURPOSE CLEANER/DEGREASER THAT CAN BE USED TO CLEAN JUST ABOUT ANYTHING. USE IT AS A NON-RINSING EVAPORATOR COIL CLEANER. WHEN DILUTED ABOVE 20:1, NO NEED TO RINSE CONDENSER COILS IF A WATER SOURCE IS NOT AVAILABLE. APPLY IT THROUGH OUR FOAM GUN OR IN ANY TYPE OF HIGH OR LOW PRESSURE SPRAY EQUIPMENT.