New owner of 2016 (around, last year prior to epa emissions add on) Compact 4520. AC was not cooling well so we attempted to clean the 3 AC and other units mounted in front of the radiator. There is no “pre-screen” in front of any unit and the 4 “coolers” are stacked so close together that cleaning these units is very difficult. Water or compressed air would have to travel thur all four in one pass to clean each.. I’ve tried high pressure air but it will not go thur all four. Is there something I’m missing as to this task?