So in summary of all that has gone before. I'm sure we can all agree on these:
Keep it clean and sanitary.
Use something that works.
Use something that is cheap.
Don't use chlorine bleach on stainless.
Works for me.
I agree 10000000000% . I buggered up a keg using chlorine but no worried cos I use this keg to sanitize the other kegs and the entire line the the beer travels "beer trail" like audit trail ( yes yes yes... I am one of those boring bloody accountants) but your point is spot on MashBasher