I went to local auto store to ask for fuel system cleaning. They ask for $90. I know getting a professional cleaning is much better option, but for now, with no job, I am trying to save every penny that i can. So I decided to rather use Techron for now. While driving back, I saw the nitrogen enrchied gas banner flying over local Shell gas station. It seems like exact same stuff like Techron. I was already thinking of filling my next tank with Chevron's Techron enriched gas. Now shell has similar stuff. I bought a techron fuel cleaning liquid bottle already. Will add it to next gas tank. But on top I wanted to use a gas which has additives to further help the cleaning. Cant decide where to go now - shell or chevron. Can you please share your opinion.