I apologize for bumping this old topic, but I have done quite a bit of research on this, so I want to share my experience.
There are many great knockoffs, house brands, OEM packaged, and custom blends that contain "techroline"
https://wheelstips.com/best-diesel-injector-cleaner the main active ingredient.
Buy your own barrel of Techroline, add it to biodesel give it a catchy name and sell it.
Just remember the Proper Alcohol (ethanol) is for Adult Beverages not injector cleaner.
Methanol used with Sodium Hydroxide is used to make biodiesel out of vegetable oil, not for injector cleaner.
Avoid any injector cleaner containing Ethanol or Methanol. Isopronol may be OK, but my CRD will not be the test mule.
History: Techroline dissolves carbon deposits that clog injectors.
Gassers would grow carbon deposits on the intake valves and choke off the engine, BMW would blast with walnut shells before Techron was developed, then the walnut shell blaster were sent to the museums. They tested Techron in diesels and it worked.
Older injectors had a small chamber between where the needle ended and the injector holes were drilled called a sack. The next generation had a low sack configuration and the ones we have now are sack less and do not hold any fuel in the sack to smolder and turn into carbon deposits. But the holes still get coated with carbon and need to get cleaned out. Injector cleaner is cheaper than poking the carbon out with a pin vise and small wire, been there done that on the oldies.
