Bgreene nailed it. The water by us is very hard. Any water that drys on a surface leaves a deposit of various minerals. White vinegar and Steel wool (The big curly kind, not the type that has soap in it) removes it. On softer surfaces use the 3M Scotchbrite type of pad so you don't scratch the surface. Vinegar is a mild acid, let it sit on the surface and do it's job before you start scrubbing. There's a reason that people clean their coffee pots, etc, using vinegar. 
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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