Found What Works On Fiberglass Showers and Tubs
I found this on another website so I can't take the credit. I've tried it three times in my master bath shower and I was stunned at the excellent results. Easy-Off Fume Free oven cleaner in the BLUE can. It's safe for self cleaning ovens and it was lemon scent. I sprayed it on as soon as I woke up, let it sit for just over an hour and came back to take my shower and finish up the job. People, people, people......the grime melted off, literally. It hasn't hurt the finish on the fiberglass so far and I'm really watching for this. If anyone out there tries this I'd love to know if they've had the same excellent results as I've had. I don't work for easy off or whatever company this is.....just a fireman's wife who found an unlikely cleaning product for the bathroom.