I purchased this item as a last resort attempt to remove years of hard water limescale from an expensive custom glass shower enclosure. I've tried over-the-counter grocery products, glass cleaners, and even muriatic acid. I was able to remove the limescale but it took many hours of power tools (with cleaning attachments) and lots of mess to clean up afterwards. I used Bio-Clean with a lined sponge and some elbow grease. Although it still required a lot of effort, I could "feel" the surface of the glass changing from rough to smooth. A few spots are still missing and my shower cubicle is now almost brand new. I used a drill with a cleaning head again, but only on the bottom third of the shower doors. My arthritis doesn't allow me to bend it as low as the pressure brush; The drill made this task easier. If you consider purchasing and read the reviews, you will see that many people are dissatisfied with Bio-Clean. I can't help but think they didn't want to put any work into the job. My water tests for 24 grains. I now have a new water conditioner that reduces it to 3 grains but 4 1/2 years of previous water practically ruined the shower. The thing really works!
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