STAR BRITE Ultimate Fiberglass Stain Remover - Easy-to-Use Marine Grade Solution to Eliminate Tough Rust, Leaf & Waterline Stains for Boats and More - Maximum Cleaning Power Gel Spray

After reading so many reviews—some saying it works great, others saying it does nothing—I purchased it, then let it sit unopened for months as my fiberglass shower floor got dingier and cruddier until I couldn't stand it anymore. So I sprayed the stuff on the floor and sides of my shower and decided to leave it for 20 min, then check back. (Directions for the 16 oz and 32 oz differ for some reason; I agree with the 32 oz directions, as that is what worked for me.) When I checked, nothing had changed, so I scrubbed a little with the soft side of a blue sponge (w/nylon scrub on the other side), but nothing came off, so I left it for another half hour. Meantime, I reread the reviews. Turns out, I found more critical reviews than I remembered, so I got discouraged and thought I'd wasted $10. But still, after the half hour was up, I rechecked the shower and scrubbed a small area...and something magical happened. The stains/grime came off easily in that area, but in others, even heavy scrubbing (again, with the soft side of the sponge since you're not supposed to use abrasives on fiberglass) did nothing to lift the stains off. So I was encouraged by that one small area, which wasn't as dark and grimy as the rest, and wondered what would happen if I sprayed heavily and just let it sit for a long time. So I let it sit for about 90 min. Then when I scrubbed, more seemed to come off, so I was like, okay, I'll spray again and let it sit for another couple hours, which took me to 8pm. When I pulled back the curtain, I couldn't believe what I saw...I turned on the shower and without even using a sponge, most of the stains and grime had disappeared! I watched as the water rinsed away the product, and the floor was so much smoother and cleaner than it had been in years. It's not yet stain-free, but I cannot believe how much better it looks!! I just sprayed it again and will let it sit overnight and see what happens. I don't even know if using a sponge was necessary. It seemed to help bring up some grime, but I think just letting it sit was the key. I mean, you be the judge...these two preliminary photos show the results after spraying and leaving it for several hours, with a minimum of scrubbing. And actually, the first photo was after I had sprayed and let it sit for a half hour, then scrubbed a little. But the major stains are still evident. I'll add more photos as I progress. I just cannot believe how well this works, and just wonder if the bad reviews are because people aren't leaving it for long enough. The bottle says a few min, not a few hours. Good idea to test a small portion (I didn't because I'm impatient) to make sure it does no harm. But OMG. I'll be getting the 32 oz bottle now because I'm already running low on the 16 oz one. Last tip: Ventilate your area. I should've used a fan, but I was obsessed with my shower and forgot. Update a day later: With more sprays left on for several hours, it looks even better. I'm having trouble with vertical surfaces because the liquid dribbles down in thin lines, so I need to remedy that. Bottom line, where the liquid sits, it does the job.

Bought this to try on fiberglass tub that had stains from many years of use. Nothing that was strictly made for tubs and shower walls did anything but this stuff took the stains right out. I sprayed it on let it set then scrubbed it with a nylon scrub brush and then rinsed it. Worked fantastic. Highly recommend this for fiberglass tubs over ANY bathtub cleaner off the shelf

At first I rated this one star because it will not work as directed on the bottle but will work adding a Magic Eraser. Tried it on a stained fiberglass tub as directed for 2 minutes following with rinse using a shower cleaning brush and the spray from the shower, nothing. Tried as not directed for 15 minutes, nothing. Tried it for an hour, still nothing. It will work if you spray it and let it stand for half an hour to an hour and then respray it and then immediately follow with a magic eraser while the spray is still wet. This modified procedure cleaned all of the stains off of my fiberglass tub and it looks like new. It says use of gloves is recommended and they are right, wear gloves when using the magic eraser. I did not use gloves but absolutely will the next time.

Didn't work for me. I had hoped it would remove stains on my showers fiberglass floor. It didn't even after 3 applications and some bristle brush scrubbing.

WOW. I had some fiberglass pillars I bought for my porch they have been outside for 5 years! I did use a soft scrub brush and cleaned them twice but I was amazed how well it worked Very Happy I found this product 1 thing it states leave on 2 minutes then rinse follow that because if you let it dry you have to reclean. I was outside so maybe dried faster

this did not work at all. If anything it made the dirt stand out more. Not happy with this at all.

Like the title says I wanted to and I should have! I was rushing to move and get everything cleaned to better than we found it. I had no idea or shower and tub were as bad as they were until I used this product! I was blown away by just how good of a job this did for cleaning what I didn't even know was there. I had no idea that a fiberglass insert could basically sparkle and shine, until after this. It worked phenomenally. The spray mechanism was easy to use where it didn't affect my wrists too much but also didnt seem flimsy or like it'd break in my hand while squeezing like cheap bottles. It did take a couple of applications and some elbow grease to be really beneficial. I did spend some time scrubbing. So it wasn't as easy as spray, wipe, and rinse for me. But like I said, there was more than I realized... It got the majority of stains, rust and calcium buildup, soap scum, and made the whole tub and shower the same color. I thought I'd use it and just toss what was left, but it was so great I kept it and will be using it in our new tub and showers. Great value for the money spent. Please please do your best to keep the area you spray it in properly ventilated as much as possible though. It definitely has a strong odor. We only had a fan to help so it was much more in the air. I'd suggest using gloves as well. I didn't the final clean and didn't have any issues but it's still a precaution to take if you have sensitive skin. With or without gloves wash your hands after use though. I will buy more when I need it again! A quarter of a bottle went a long way.

My boat had been left in the Missouri river for over 5 month and developed a heavy stain on the hull. I sprayed this on the hull and within a few minutes 95% of the staining dripped off. The few remaining stains might require some rubbing compound. Overall, a good product.

I used this to remove years worth of water marking and rust staining on a fibre glass fountain base. It worked a treat, just spray it on, immediately it starts to remove the stain, and a quick scrub on the stubborn sections all staining was gone. Amazing stuff!

Enlève vraiment les tâches sur les parois en fibre de la piscine creusée. Efficace mais on doit utiliser beaucoup de produits et il faut vider l’eau pour nettoyer les bords de la piscine . Important: Il y aura donc une démarcation sur les parois selon le niveau d’eau qui sera retiré de la piscine .

This was called a gel.IT IS NOT.TOTAL WASTE OF MONEY.Did nothing after 3 treatments..At nearly £40 a bottle I feel totally ripped off.DO NOT BUY

Wish we had taken a before and after photo. This worked so fast without scrubbing; just spray and rinse and our boat looks new again.

Unfortunately this product did not work for us, followed instructions and scrubbed 3-4 times , would not purchase again