Let the scale come off own it's own thru use and such , it will help with keeping rust off, also what I have done before is to pour some oil on the surface ,spread it around ,just a light kinda layer every where , let it soak in overnight , next morning use some paper towels or clean rags and wipe off the excess. I've done this with one at work and ten yrs later I still have literally zero to no rust on it .
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