Wrothgar,
Nice rifle! Modern Prvi Partizan is non-corrosive. I shoot lots of corrosive ammo in my rifles and it's no big deal. A several squirts of water or windex down the barrel and on the bolt face and clean as normal. Here's a good site for taking it apart and putting it back together.
http://www.surplusrifle.com/mauser98k/index.asp
TK