Just had our unit replaced and the installer said not to use bleach as just the fumes alone from it would affect the aluminum A coil which is in the new system. (No longer copper) So you need to play it safe if you are not sure which type of A coil you have. Vinager and warm water best bet. Shop vac does ot hurt. But I like the OP’s water solution with the hose as long as it does not pop out of pipe.
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