How to remove rear hub covers I'm trying to service my DT Swiss wheels. 

I watched some videos that show how to grease cartridge bearings but don't understand how to get to them. I tried to unscrew the ends using two adjustable wrenches but just ended up stripping the edge of the nuts. 

How do I get he end nuts off the axle?
For the inner nut you need a special wrench that is slimmer than a usual one - as slim as the nut is. For the outer nut a normal wrench will do - hold the inner one and turn the outer one until they no longer lock each other. Then you can take them off both.