Thanks for the reply Greg.
I tried hitting the same area with a 3M Scotch and 80 grit sanding pads. It looked a little better but wasn't totally gone so I hit it again with the sandblaster. The picture is attached. There's still discolored pitting so I'm not sure where to go from here. I'm not afraid of a little elbow grease so I can keep sanding. I just don't want to take too much metal off.
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