Mary:

Over the winter here in Texas (I guess because of humidity) here we get a nasty green algee on the boats outside, not counting the UV damage and just plain dirt and grime. It is so NICE <img src="http://www.catsailor.com/forums/images/graemlins/cool.gif" alt="" /> <img src="http://www.catsailor.com/forums/images/graemlins/smirk.gif" alt="" /> <img src="http://www.catsailor.com/forums/images/graemlins/grin.gif" alt="" /> to just wash the sand off at cleaning station and put it away after a hard day of sailing. Also nice to have extra security of no one messing with boats.
Doug