Diesel Purge is mostly Diesel fuel. For best effect, have the IP draw Diesel Purge from a separate container and have the return line dump back into the same container. Run the engine until that container is about empty, or all the way empty if you have a good hand primer.

I don't know where you can take a MB drive shaft to be rebuilt. Getting it off the car is about the most difficult step.

Have you read the DIY guides on the forum - http://www.peachparts.com/Wikka/DoItYourSelf ?

Sixto
MB-less