I use the basic Ducky water spot remover. Works like you described the Hot Sauce -- spray on, wait 10 seconds, wipe off. I first tried vinegar and it didn't touch the spots Ducky took off.
I do regret not buying the Ducky Water Spot plus that includes wax like the Hot Sauce. Didn't see that before ordering.
I will get a bottle of Hot Sauce to try so I can get that glossy goodness without a separate wax afterwards. It's $20 on Amazon Prime so I'm sold... The before/after on that blue Yamaha is incredible.