Guest guest Posted September 25, 2010 Report Share Posted September 25, 2010 The concrete slab the A/C unit is on has green stuff on it. Would you use a vinegar mix or what? Can that get into what the system? Do you hose down the unit? We're having an industrial tech come soon to clean the ducts & HVAC. The green growth on the wooden mailbox post stopped or isn't visible for now w vinegar & water. Thanks, Kathy Quote Link to comment Share on other sites More sharing options...
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