Chemical Guys ACC506 Light Duty Spinner Multi-Surface Drill Brush Attachment - Power Scrubber for Stains & Gentle Cleaning on Upholstery, Fabric, Carpet (Fits Any Standard Drill) - Perfect for Car Detailing, Home Cleaning & DIY Projects

After reading many reviews I decided to order the Revolver drill brush & Nylon Stiff Drill Powered Scrub Brush and this is a comparison between the two brushes. For the tests I used them both on a tiled shower, a ceramic cooktop and a bathroom sink. The cordless drills that I used were both 18 volt Milwaukee drills on low speed. I used different cleaning compounds on the surfaces but none were harsh chemicals as I was testing the brushes not the chemicals. The cooktop had some burned on stains and both the shower and the sink had some iron staining and calcium scale but not severe as I usually clean them with an acid to keep them clean.Without a doubt both brushes performed admirably but there were slight differences. The Revolver brush easily gets into corners because the bristles move outward with increased rpm (the stiff nylon does not) but the stiff nylon did a better job of scrubbing. When using the stiff nylon brush you should operate in both directions otherwise the bristles will gradually stay bent in the predominant direction. Both brushes removed the iron staining fairly easily but had more difficulty with the calcium (lime). I could see that I was removing some grout (by the color) so I would suggest you not scrub too hard. The use of harsher chemicals is probably a better choice rather than the heavy handed approach.I was pleasantly surprised how well the brushes did on the cooktop. Here the stiff nylon brush worked better in the burnt on (I thought forever) stains. They both worked but the stiff brush was faster. Once I completed the cleanup and buffed the stovetop it looked like new once again.