I'm certainly no expert, but...
I was a hardhat diver in the US Navy
and spent many years working offshore oil
platforms & drillships after that.
My personal favorite yacht tool for barnicle removal is a type of putty knife / scraper from Ace Hardware
It has a flexible stainless steel
blade with a rivited rubber handle and a hole for a wrist lanyard.
But the best part is the blade which is about 3" wide with one side formed into a pointed tool for getting into tight spots and the other side shaped with a simicircle which makes a quick job of cleaning
shafts up to 2" dia.
The corners are rounded so it won't scratch and it's the best tool I've found for cleaning
the slots on an external thru-hull strainer, as well.
The last one I purchased cost less than Five Bucks... but would be good value at twice the price
Spend a half hour snorkeling with this and a ScotchBrite Greenie Pad and even a slightly fouled prop will reward you with at least a knot
of speed... and optimum fuel
Easiest way to remove a propeller
in the water
? "DetChord" - just be sure to attach a safety
line or you run the risk of blowing the prop into the rudder
, loosing it in the muck and then requiring a tow to the slings to repair the rudder
a new prop! But that's another thread entirely.