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A lot depends on the goal, hogging off material or polishing. Most knife guys that hand sand, sand dry to shape / refine and use oil, Windex or Simple green to finish.

I don’t use oil to hand sand...

Restoration begins at purchase. Buy razors in the best condition you can afford. As Christian said do you want to put 5 hours into a $50 razor?

Buy good sandpaper, cut into 3-inch squares, (old...