Clean Guard™, Clean Guard™ XL and Clean Guard™ CC are reusable maintenance bags specifically for use by HVAC contractors to clean wall mounted mini-splits and ceiling cassette systems with Nu-Calgon cleaners/disinfectants when the indoor coil and blower require service. Clean Guard™ installs in seconds with its use of an industrial grade elastic collar that simply and automatically adjusts around the indoor unit. There is nothing more simple and quick to use in the market. The device provides 360 deg coverage to protect overspray on the walls, an integrated eight foot drain line and heavy duty design to allow its reuse. For future use, Clean Guard™ simply needs to be rinsed, dried and stored in the five gallon bucket used to collect the cleaning solution during service.