I have found a new one that I love. Made by Wurth. Called Injector-EX. I used it the other day and love it. It is $$$ (25 bucks a can)
OK back a while ago I used Pretune . It was a product by Toyota that has been discontinued. It was well known as a great product via any forum. Contacted the maker and nothing. This stuff was AWESOME. BUT no longer available.
I used Injector-EX on a stubborn 02 sensor. Trust me. I was thinking I was going to mess up the threads getting it out... Minor work and it came out easy.
Not sure how it would compare to other fluids or oils. I know you have your own.