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I would not use a brush on fins ...
BUBBLING cleaners are used by pros for inside and outside coils of AC units... the non corrosive on the insides... harsher stuff on the outside...
I have not seen it except in gallon containers which you dilute some and spray on... but that was several years ago...
I would not spray anything volatile on it because it might stay in the insulation , or dissolve the insulation inside the evaporator giving you no options except to replace...
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