How do you know that they are fouled? Does stuff that you can see on the injectors actually mean that they are fouled inside?

Why not just use injector cleaner as a solvent to clean them?

After you clean the injectors, save it and dump it in when you fill the car's tank.

Why not use injector cleaner in your fuel?

Could trying to clean them at home actually cause problems with them?

My dealer uses Techron - They used to put it into every car they service - I do not know if they still do.

I put a table spoon or so in my small engines. When I put some in my snowblower the first time, i made a small hole in the foil seal and put it in while it was running, and I could actually hear it run smoother.