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I think that a lot of edge deterioration is the result of corrosion. Cleaning the residue off before the blade is stored for a couple of days can't hurt. Might also be that whatever traces of oil are...

One of the most valuable tips that I learned off this forum was to wipe down my blade well after shaving and then give it about 15 laps on the leather strop before putting it up.

I have a 3 razor...