When I dial one of the my mill vises, make some cuts, vacuum off the chips and coolant mixture, I leave it that way.
My brother takes his vises off, wipes down the table, and leaves the mill with no vise. He claims the coolant causes rust under the vise.
When I take off a vise, there is some discoloration, but it comes right off with a fine stone. I think I could repeat this for years before I picked up .001" out of flat on the table. I like having the mill ready to go.
But that is all seat of the pants for both of us.
Is there some definitive knowledge?
TIA Clark