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.

Amazing, though I'm not using this for boats , but for fiberglass bath tub instead, they simply clear up the rusty water stains i could not clean up with other bathroom cleaners. No hassle. Rust stain just disappeared.

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.

Sorry, but I'm going w/ don't waste your money. Going to probably write or complain to the company. Directions state to spray on, no need to scrub, leave on for 2 (yes TWO) minutes (yes MINUTES), then rinse off and watch those stains disappear. If needed, repeat. I left followed directions, leaving the second round on more like 20 minutes. No change. As one of the previous reviews noted, it sounds like you may need to leave it on all night. My boat is outside when I'm prepping it for winter, however, and day temps are appropriate, but I'm at work and can't sit here all day monitoring. Can't leave this on my boat all night either. If directions need to state options like leaving on for a substantial amount of time, then they should state that without me having to fish out an Amazon review. I simply don't have a whole day to waste on this right now, especially since my boat is not kept at my property. See pics - boat pic 1 after first 2 rounds of treatment, second pic after leaving the spray on for hour to hour and half. Do I seriously need to leave this on for several hours??? I was told by a boat company to maybe just get some muriatic acid and dilute or test and see how that works. I'll probably do that next, or maybe wait til spring. Very disappointed. Star Brite: get w/ the program and improve your directions. I'd like a refund... for the bottle and for wasting my time.

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.

Didn’t do anything. Like literally dish soap and a sponge would work better. Don’t waste your money. Update: I treated the area several times and left the product on for an hour each time. Then I also used a sponge and brush. It does work pretty well but not as described in the instructions.

This is amazing for yellow stains on fiberglass tubs!! I bought this, but in on and it completely took off the yellow. I am so happy with this product. Well worth the purchase price!!

We live on an acreage in the country where over time, rust builds up in the tub and shower. I have tried all types of cleaners but nothing seemed to work real well. Finally decided to give this a shot and it is amazing! Sprayed it in the shower and let it set for 30 or so secs before scrubbing with a brush. Can't believe how well it worked ! Just and fyi, make sure you have the windows open and no kids around because this stuff does take your breath away if you get too close. Made cleaning the bathroom way too easy.

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

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