What kinda detergent can I use with my SPX-FC34 foam cannon? Only use pressure washer detergents with your SPX-FC34 foam cannon, like Sun Joe® HOUSE + DECK WASH, SNOW FOAM AUTO WASH, or HEAVY DUTY CLEANER. (SPX-HDC1G), Sun Joe® SNOW FOAM AUTO WASH (SPXFCS1G), or Sun Joe® HEAVY DUTY CLEANER (SPX-APC1G). Related articles Can I use disinfectants as detergent with my pressure washer? Why is my SPX-FC34 not dispensing detergent? Why is my SPX-FC34-MAX not dispensing detergent? Which detergent is compatible with the SPX-FC34-MAX? Will my SPX Pressure Washer accessory work with the on-board soap bottle on my unit?