The only thing I clean my shower with. Actually gets off soap scum and tub ring. Cleans the grout like no other. And the bottle is nice too. Easy to hold and sprays a good mist. Just be well ventilated! This is not for the faint of heart or those with breathing conditions.
I've been battling hard water for years, this is the first product that finally eliminated the hard water film on my shower door. It took using it a couple times, but it's the only thing I've found to do the job.