What's the "pure" Techron bottle look like? Hadn't heard of it. Just use the stuff in the black bottle at Advance Auto.
There's Chevron Injector Cleaner that says "includes Techron", and then there's straight Techron. I've purchased the straight in both 12 and 20 oz bottles.
Redline makes good stuff I think, I've used their Redline Injector Cleaner also, and it is cheaper to use as one bottle (usually pay about $7/bottle) will treat 100 gals of gas. Have used this when I could not find Techron easily.
Just tried Seafoam last oil change as injector cleaner. Heard good stuff about them, and my friend had some at his auto repair shop, so I just got it from him because I was there. I expect it will work well also, based on what I've heard about it.