I was skeptical at first, but this little kit saved my ancient window AC unit from an early retirement. The stainless steel fin comb is surprisingly sturdy—once I figured out the sliding adjustment, it made quick work of bent fins without snapping them (unlike my previous DIY attempts with a butter knife... oops).

The real MVP? Those whisk brushes. They're stiff enough to dislodge years of dust bunnies from my coils but won't scratch the delicate surfaces. Pro tip: Use them dry first to knock loose debris before spraying cleaner—it prevents that gross muddy paste situation.

Did have one wire pop loose on the comb during aggressive fin-straightening, but a dab of super glue fixed it. For $15, I expected way less durability. Now I keep this kit next to my vacuum—turns out the brushes are perfect for baseboard radiators and fridge coils too. Not bad for tools that fit in my junk drawer!