I have been searching for a cleaner to remove hard water spots and mineral deposits. I have a clear glass shower and have tried everything from calcium and lime removers to Brillo pads! I have spent upwards of two hours trying to get my shower clean [which for me means looking like new]. It only took me 45 minutes to clean my shower last night. I can't wait to fully use the protectant, it worked very well on the one pane I put it on.