First of all the device I used this on was unserviced so there was a *significant* buildup. That brush alone, as reflected in my photographs, made a very noticeable difference. This is followed by a thorough brushing with a water spray, followed by a condenser coil cleaner. The block looks very different. I spent about $34 instead of the $289 I was offered to "dry clean" the condenser coils. Good luck and always turn off your device before you start work!
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