Absolutely Boat Bling Hot Sauce. I have a dark colored boat which we use 3-4 days per week during the summer. I don't wipe the exterior down every time we're out so I use Hot Sauce once per month. It is nothing like vinegar. I've tried vinegar and it does not work at all to get my hard water spots off. I've tried a bunch of other brands and they did not work nearly as well. Hot Sauce is the best I've tried, by far. Simply spray and wipe. If you have really stubborn water spots, spray, let is sit for 15 - 20 seconds, and then wipe away. I buy the stuff by the gallon. After 10 years, my hull still looks new.
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