Admittedly a minority of chromed-razor users experience this problem, but it does exist. I have read that the Merkur customer support staff offers little solace to customers when this happens, blaming hard, calciferous water and not following Merkur's recommended maintenance steps.
- Cleaning with a soft nail brush or toothbrush the moving parts of the razor after each shave to thoroughly remove soap residue
- Regularly (depending on how hard the water is) put the razor parts in a diluted decalcifying solution for 15 to 30 minutes (not more), removing the parts every few minutes (presumably to check if they are decalcified)
- When I first get a razor, I actually wax it with a durable polymeric auto wax. (I use a brand that recommends its use only once per year on a car.) I then would re-wax the razor about once a year.
- I actually disassemble my two- or three-piece razors after each shave, then....
- I rinse the blade in water, and gently press (not wipe) the blade dry with a square of TP on top, a washcloth underneath; then I flip the blade and repeat
- I rinse the razor parts, then dry thoroughly with the same TP square
- Then I reassemble the clean and dry razor for the next shave
- Wax a new razor with a durable auto wax when new and once a year thereafter.
- Daily, rinse the razor clean in water, shake it out, also perhaps blow out as much moisture as possible, and then set out to dry in the open air.
- When it's time to change the blade, thoroughly clean and dry the razor using a soft toothbrush or equivalent. Then insert the new blade.