I just have a small set up at home, 2 kegs. I'm currently using PBW to do my cleaning and to flush lines, then I usually run some Star San through all the kegs/fittings/lines/faucets just to ensure all is good and sanitary. I like the peace of mind of knowing I've taken steps to get them good and clean; you never know where the tubing has been before it got to you.
In regards to Oxiclean - I'd make sure it's the version minus the added scents and whatnot. In the US they make an Oxiclean Free that I have used to clean bottles in the past.
YMMV, and I know there are some advantages to running through BLC or a stronger solution from time to time.