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Message: <blockquote data-quote="longjohn119" data-source="post: 139483" data-attributes="member: 2826">I use acid based aluminum cleaners all the time to clean aluminum finned condenser coils on large commercial AC units. Just make sure you rinse it well .. and then rinse it one more time just to be sure. Especially important is to get any standing rinse water out of the boat or at least make sure it's well diluted because if it's allowed to sit in a low spot or crack it will continue to corrode the aluminum. Basically all an aluminum cleaner is is a controlled corrosion which you stop by fully rinsing off the acid. Look for a white powder after any sitting water dries up and if you find some re-rinse that area really good. Like I tell my apprentices when I'm training them to clean coils, it's impossible to over rinse but extremely possible to ruin a coil (or any other piece of aluminum) by under rinsing.</blockquote>