but I still worry I might stain it. Any thoughts or ideas??
i wouldn't worry to much.
i've over nighted a lot on my boat. mostly in my local watering hole. i wouldn't call it particularly clean. usually just one night though. here's the worst i got.
that's the side and this is the bottom
i've never figured out what that is. it did however wash off, with effort.
as for a slime ring. i've got that too. i over nighted in the missouri river. now that's a really filthy dirty river. even an day of boating in it will put a bathtub ring on yer boat. over night in it and it's a greasy dark ring around your boat. it also washed off with water and effort.
so, imho, i wouldn't worry about it. just wash whatever foul crap that gets on your boat off right away when your done with it.
last comment. i inherited my dads boat years ago. dads boat sat in a lake in mn. all summer long (it is a pretty clear, clean lake). never got removed from the water. it was tied to the dock. now that had a ring around it. been a while since i did it, but i think i used 25% muratic acid + water to remove it with a stiff bristle brush. it worked and when i was done it didn't have a ring around it. it was however labor intensive to remove, even with the nasty acid.
go boating and enjoy your over night fun. it's a great thing to do with your boat imho.