TotalBoat White Knight - Quitamanchas de fibra de vidrio, 15 onzas

I used it on a shower pan, and it worked great. Was very happy with the results.

Worked better than expected on an older fiberglass boat interior. I applied it with a chip brush on a wet surface. After 10-15 min I scrubbed it a bit with a stiff bristle brush. I'm sure multiple coats might be needed on really bad spots. Just depends on what type of stain it is I imagine. I took a picture after doing one coat on half the bow deck.

Had a issue with our water filtration system on our well that caused stains from minerals in the shower. After the water issue was fixed, tried several products I have used for removing stains before but they just ran down the walls of the shower leaving streaks. This product lets you paint it on (it's a gel) and really cleans without scrubbing. A real time saver. The only critical thing I have to say is about the packaging and shipping of the product. While it was in a plastic bag, several ounces of the product leaked out into the bag. The lid should have been taped shut.

Used the whole can in 3 applications on fiberglass shower floor. Did not take off very much of the stains.

This stuff did the job that several other products I tried could not. The yellow literally disappeared in seconds. I cleaned the hull of my 24 foot boat and I barely used any out of the container. No scrubbing needed. Wet the surface apply with a paintbrush or a cloth. I used a cheap paintbrush. It said let sit for 10 minutes then wash off with a scrub brush or sponge. Reapply if needed. I didnt need to reapply and there was significant yellowing on my hull.

I have some stains in my gelcoat probably from the boat being under or near some trees and this did not do anything to remove or lightening the stains despite using it three times and letting it sit and then even scrubbing it into the surface. Softscrub worked better but I really did not want to use anything even mildly abrasive, even like Barkeepers Friend. I have to find something else to remove these stains but I was disappointed with this.

I put practically zero elbow grease into applying this to the stern of my fiberglass saltwater boat and it just made the hull and the stainless look pristine! I've attached the port and starboard pictures of my stern after having just applied to the port side and port trim tab. Even the stainless trim tab looks incredibly better! I definitely recommend this and can't wait to get just a little time to get the rest of the boat clean like that stern.Do take precautions to not get this on your skin - it will burn...use long dishwashing gloves.

My boat was neglected for 9 years. I had stains in the gel coat from lichen and moss growing on it whilst sitting in the yard. I tried everything I could to remove the stains. I used toilet bowl cleaner, high end boat cleaner, purple power cleaner, and a lot of elbow grease, but could not get the stains out. Another person suggested wet sanding with 1000 grit sandpaper. I have no idea how to wet sand. So, I was reading a thread about a forum. I started researching the stain removal product that was suggested and I stumbled upon White Knight. Holy Moly, am I glad that I did!!! It is literally as easy as it says it is. Apply and wait 15 minutes, then spray off. You can watch the stains disappear before your eyes. Follow the directions to a T and you will be amazed. I will still have to hit …