Welcome to the site munch
I have a V-20 I/O with the 350 volvo penta dual prop. I use a product from boaters world in a white and purple bottle for rust removal. I squirt it on and leave it overnite and its gone. It is clear and thick (like naval jelly) but it works great.
garage
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Tis better to be quiet and thought a fool than open your mouth and prove it!!
1991 V-20 cuddy I/O 350 volvo duo prop, 1998 15ft Grumman 9.9 Johnson 
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