Serious question - I've been wet shaving with DE razors for a bit over a year. I've two razors - an Edwin Jagger 8911 and a Merkur 34C. It doesn't matter which one I use (with same blades, pre-shave oil, and soap), after about 6 weeks I can't get my problem spots clean shaven. If, however, I switch to the other razor I get very clean shaves for about the same amount of time and then have to switch again. I change blades every 4th or 5th save. So, why am I getting a good shave for 6 weeks and then it degrades until I switch to the other razor?