Product review (4 stars): We didn't even know we needed this, until we needed this!
We moved into a house with an older refrigerator, and it occurred to me that I should check under the unit to see if it was clean. WOW, it wasn't. I wasn't sure how best to clean out all that mess, and was relieved to see this in the Google results.  It does work well to clean the coil, though there were no real directions with the brush. Be forewarned, it is long, and that will be a factor in where you can store it till you need it again.