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For wall-mounted mini-split indoor coils between 18,000 and 36,000 BTU (1.5 to 3 tons) in size, it will require the larger Clean Guard XL (4150-02). The Clean Guard will also require the use of a readily available five-gallon bucket and the use of a suitable Nu-Calgon cleaner. The device provides 360-degree 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. 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! Select a Nu-Calgon coil cleaner that is best suited for the job. For coils and blowers that need to be cleaned and disinfected, Nu-Calgon’s Evap-Fresh gallon (4166-08) with the use of a 50P Sprayer (4770-0) or Evap-Fresh No Rinse aerosol (4166-75) with the use of the Talon Flexible Wand (4776- 0) are good options. For tough duty, Tri-Pow’r HD coil cleaner may be necessary; but the use of Tri-Pow’r (at a 3:1 dilution) requires a water rinse. NOTE: Some tough applications may still require a follow-up rinse with pressurized water using a market available sprayer. While cleaning, keep an eye on the five-gallon bucket to make sure cleaner/water is draining into bucket properly; resolve any kinks in the Clean Guard as necessary. Recommission the mini-split system back to service. Rinse, dry and store the Clean Guard inside the bucket for repeated use.