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Waterspots. All of the above will work unless you live/boat somewhere like i do where there is a very high mineral content in the water, then your hosed. NONE of the above mentioned solutions will remove hard water spots. I know because having black hull boats for the last five years i've found the one solution that works. Prevention, don't get 'em in the first place!
If you clean the hull of the boat real good and apply a couple heavy coats of a good quality marine wax a couple times a season then you won't have a problem. I wax with Meguiars Flagship Marine Wax twice, then immediately apply Babe's Boat Bright over the wax. This makes it so slick that virtually nothing will stick to it.
When you pull the boat out of the water, immediately use Babe's Boat Bright at the ramp clean-up area and it will look like new. Even if the water dries before you can do it you'll have no problem. Spray on the Babe's and using a microfiber towel wipe the boat down, wet or dry, clean or dirty, it will not scratch the boats finish. The wife and I tag team it, she applies and wipes the grime and i come right behind and buff it all out before the Babe's dries. If you do this every time your boat will always look like new. I've done it this way for two years on the LSV now with no visible scratches on my black hull.
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I just started using Babe's hard water spot remover. Stuff works awesome, but will also strip the wax a bit so you will have to wax over the spot again.
I will usually use Babe's Boat Bright over the top of it after I get the water spots off.
For some of the harder stains/spots I will use a really light rubbing compound and I also just started using Wizard's scratch remover and Wizard's Shinemaster. Stuff is great and I believe it is more of a wax replacement/cleaner.
I use it on the hull for some of the yellowish stains and it takes it right off.
I also just bought some Collinite fiberglass boat wax #925 and this is by far the best wax I have ever used. Stuff smells a bit funny and is kind of greasy, but wow it leaves a really nice slick finish and it is really easy to take off and I believe it is "detergent proof."
Just make sure you apply it really thin.
After I pulled the boat out Saturday I hardly had to wipe it down and there was barely any scum and it was still as slick as when I waxed it.
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Yup, Babe's Boat Bright. I do like Razz except that I have two spray bottles of the stuff and two microfiber rags and I have two of the crew immediately liberally spray and wipe the hull after pulling it out of the water, one person on each side. I then put away the stuff inside the boat while they work on the outside. Works great and the gelcoat always looks shiny.
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Babes is the only way to go, so simple and all there stuff works great. I have the gallon of the boat bright and am constantly refilling my spray bottle, the water spot remover is unbelievable, I need to get a refill. Last the boot butter is about the best boot lube I have come accross, worth a try!