We offer the widest variety of HVAC Drain Cleaners , including Nu-Line® is the Industry Standard when it comes to Air Conditioner Drain Line Build-Up Removers! Nu-Line air conditioner drain line cleaner help prevent A/C drain line clogs and water leaks by removing slime build-up and keeping drain lines open. Use it every 3 to 6 months to help prevent water damage and mold growth from clogged drain lines. Simply pour into condensate drain line , pan or pump.