I like CorrosionX better. I have both, and brought the Corrosion Block home, and keep CorrosionX on the boat where the toughest requirements are.EV21
I used the 12oz spray.
http://learchem.com/userfiles/CB-12oz--20012(1).gif
I have also used the small tube of grease on gears of my winches to test the product. I'll report back my experience.