Extend the ram/rod on the cylinder and rip a narrow piece,-(1/2-3/4") of fine emery cloth off a sheet and polish only in the rusted area where it goes in the seal, taking care to go around the shaft, not length wise.
No need to polish the unrusted portion of the rod as they are either chrome or a fine ground finish
Do not wire brush in the seal area, as you don't want the pits in the shaft from rust to become craters to allow oil leakage. most of the time it will work with little seepage.
BTDT.
Farther out on the rod it's ok to clean as you want,and paint to stop further rusting, being careful not to paint where it goes into the seal.
@ this point it is what it is, and just might work good for you.
I've saved a few plow cylinders that way.
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