Soda blasting Alt.?

I want to clean the outside of the Alt. that came with my donor engine. It's a mid 70's square back. I don't have a way to remove the pulley. Could I soda blast it without taking it apart? I would use regular baking soda and as little pressure as possible. If I did this, could I just hose the whole thing off with the hose? Will welcome any other ideas out there.
Thanks,
Mike