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I use a little mineral spirits and some steel wool and rub. I'll freely admit that I'm not real uptight about mirror-like finishes on my cast iron top. Clean and smooth is the standard for me.
On some cast iron tables, if there's significant amount of rust, I'll put a 150 grit disc on the ROS and hit it with that first.
Ray
(formerly "WxMan")
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Location: Kansas City, Kansas
I keep several used 150 grit ROS disks for things like that.
Little WD-40, sand the rust away, clean with alcohol and wax.
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Single edge razor blade - can be done dry or with some wd40.
If you have just seasonal surface rust, it goes quickly - probly moreso than you might guess.
I'm not a fan of any kind of sanding- overkill- my 2 cents.
te
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Bar Keepers Friend. Find it in the cleaning aisle at the grocery store.
Be advised WD40 does not cut/dissolve rust. It will only work as a lubricant when using other methods.
After it's clean, put a lot of paste wax on the top and melt it in with a heat gun. Then buff it up.
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I do all of the above. Steel wool, 600, 400 grit steel wool, WD-40, etc.