Chris Walker (he's on the forum somewhere) has a really great spot remover and it's the best we've used. It's called Spotless, check it out here:
http://spotlessboat.com/product/
I haven't used Hot Sauce before, but have used Babe's Spot Solver and Spotless is much, much better to use. Puts a nice coat of UV protectant wax on the boat when you wipe it down, too. More expensive, but worth it.