I have purchased a Chris Craft 328 with Volvo
Duo Drives that has been in the water
for 16 years with the exception of pulling it for hull
painting and lower unit service
. (Lube and new bellows). The units have what appears to be mineral growth on them. I have tried using a scrub brush to remove this with limited success. I know it isn't that big a deal to have them pristine, but I would like them to look better. I was just told to use scotchbrite pads on the stainless props. Anyone have any idea what to use on the lower units?