The bands? Meh, child's play!
The band RETAINERS, on the other hand? Either type would be rejected as too big a torture, even for hell.
The worst thing with any Mauser has to be cleaning the rear face of the locking lug recesses, especially the one in the top of the receiver ring. My pinky doesn't bend that way, and a toilet brush is just too big.
A lot of the 8mm I shoot is corrosive, so I am pretty obsessive about getting EVERYTHING gone over.