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It will work,,,a few drops down the open head, sit for a few minutes, then open & close a few times.

Use Mothers if you want; on the DE Gillettes I use Colgate toothpaste (white regular), instead of Mothers, it's m not as abrasive & really brings out a decent shine & no need to worry about any left...

Great find,,,they look like Gillettes, after you clean them they will probably real a manufacturer on the bottom.
I would avoid the vinegar soak for now, a soaking with "Scrubbing Bubbles" in the...