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I just cleaned my razors today. A little warm water with a drop of vinegar will do the trick. Soak them for 20 minutes or so and then gently clean them with a toothbrush and some green soap. Rinse with cooked or distilled water and dry. I wanted to buy an ultrasonic cleaner but for the 80 bucks I rather buy a new razor ir some good soap!
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Gentlemen,
A soft toothbrush and warm soapy water does it for me several times a year, plus a warm bath in Barbacide. I try to avoid vinegar, as many of my double edge razors have buffalo horn, wood or acrylic handles. Also, I remove the blade after every shave and thoroughly rinse and dry my razors before putting them in the rack. That also helps in their general maintenance.