re: OT Public Service Announcement - Clean your A/C fins outside

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is there a more scientific method?

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there is a foam you can spray and let sit for 5 minutes and then hose off, it's about $7 a can.

You should hose it from the inside out because the air flow is from outside in, going out the top. So hosing it just from the outside could just jam the trash/dirt into the fans even more.