Here is a theory so help me understand this - about 7 years ago or so I pulled the carb off my Dads 1973 Kaw 175 dual sport which had been sitting a number of years. That thing looked pretty bad, like it had dirt in the float bowl. wow
Not having official "carb cleaner soak solution" on hand I looked around the garage and I had a bottle of STP Carb Cleaner, black bottle, which said 1 bottle treats 20 gallons. I feared the strength of this stuff would quickly eat away at the jets themselves because I was using it at 100% solution.
I soaked the jets for a few minutes, then checked them. No change. Let soak about 5 minutes, no change. 10 minutes, no change. An hour, no change. Heck, I'll leave them in the glass cup of 100% overnight - no change. That stuff didn't even phase the grunge.
I went to auto parts store and bought the commercial gallon of soak. It cleaned the jets, etc, within an hour.
My theory - if the 100% solution of bottle carb/fuel injector cleaner can't even phase this stuff, how in the world is it going to work when diluted?