If you're berthed in water
where extreme growth is a problem - jump over the side with a heavy duty trash bag and a plastic zip tie and "bag" the prop.
Carefully pull the bag around the prop and then zip it around the shaft.
This will absolutely prevent fouling from marine
Obviously - you'll want to remove the bag before casting your lines. Duh.
I use heavy duty black lawn & garden bags and attach a reminder note to my key.
Use "parot nose" wire cutters to cut the zip tie and remove the bag.
It takes about a minute and two breaths of air to install... and half that to remove.
Capt Kirk ~~~_/) ~~~ s/v GALLIVANTER ~~~ St Thomas
PS - People have suggested I pour a cup of bleach into the bag for long term storage
and Aye suppose it couldn't hurt...