Daft question maybe but I presume it won't rust either so long as it's dried off properly?
I agree that if you've got the stage of removing the wiring loom you might as well do it right. I know it's another time consuming tasks but if you don't do it now you never will. Although only you'll see it it'll be very satisfying when it's all back together and everything is super shiny instead of being let down by a grotty loom. You may also find a few nicks or burns along the way that patching! Adhesive heat-shrink tubing is good.Part of me keeps thinking 'well, if you're going to do it right'. ;-)