To be honest I'm a fan of the string noise, keeps it human!
But, if you are getting an inhuman amount of string sound then there are a few things you can do,
firstly, look at your technique, sounds obvious but thats what CAUSES the sound after all, eliminate it at source!
then look at the sound on your amp, cut the tops a bit.
Try moving the mic in front of the speaker around, see if any area accentuates the sound.
in your program cut the highs, listen to a really bad section on loop and sweep an eq with a huge boost until it sounds really bad! then when you are sure it is as bad as it can get change the big boost to acut, adjust to taste.
cubase is a good piece of software for editing, get out the scissor tool, find the offending slides and slice them out. depending on the bass line this could be really effective or destroy the line completely. If its the right sort of line you could easily get an un humanly clean recording really quickly!