I had a booth at the Nashville AACA swap meet over the weekend. I brought 50+ V8 exhaust manifolds. Mostly SB Chevy but some Pontiac, Olds, and Ford. Probably 35+ were from the 60's. I had 4 C4 Corvette manifolds and the rest from the 70's. I had removed cut off pipes and any bad studs, might have hit a few with a wire brush. Not filthy dirty, overly rusty, or greasy; just as-found kind of condition. I did not sell any of them. One of my friends who helped me run the booth said I should clean them better for next year. (Nobody touched or even inquired about the Olds, Pontiac, or Ford so I will just bring the Chevy ones back) This morning I have researched this a little. It looks like you either blast them or use electrolysis. I don't know much about electrolysis, but I'm thinking this is not the way to go. I have a pressure sand blaster, but I am thinking this may be a bit harsh-especially on numbers? I can buy a cabinet blaster and use that I suppose, it would be a good excuse to get one. If you did this what would you use for media? Like walnut shell or something soft? Sand? Baking soda? I've been saving this stuff since the 80s, and I am ready to move some along to someone who will use them, but I'm not taking the $5-10 that people were offering. I want them clean and with easily readable casting numbers and dates. Any thoughts or advice on cleaning these to sell?