CLEAN HORIZONTAL COIL & PAN IN A/H LVL1 NO REMOVAL W/ LIGHT SELF RINSING CHEMICAL TO PREVENT POSSIBLE MOLD FROM BEING DISPERSED IN YOUR HOME, YOU MUST KEEP YOUR EVAPORATOR COIL CLEAN. IF NOT CLEANED, DUST AND DEBRIS CAN CAUSE MOLD OR MUSTY ODORS. DUE TO STUBBORN DEBRIS, SPECIAL CHEMICALS WILL BE USED TO CLEAN THE COIL.