I have not noticed any difference in the quality or cleanliness of my blades after using them. I missed the return window so it's just garbage now. I have used Gillette Mach 3, Mach 5, Schick 5 and Venus 4 blade cartridges several times as intended. Literally no change in the look and feel of the razors - and I've used new blades to start my experiment with each brand. After using this useless tool I noticed a build up of skin cells and the dirt was unaffected so I wiped the razor with a towel which was 100% effective.
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