My '96 Ford Windstar tended to develop deposits over the spray end of the fuel injectors over time.
It was not phased at all by Redline, Techron, and a bunch of other cleaners.
My mechanic told me to try Berryman's B12 Chemtool......in the metal can.
This cleaned up the deposits.
He explained to me that the other cleaners that I mentioned are DETERGENT based, whereas the Berryman's is SOLVENT based.
From this......I decided that Berryman's is a good once in a while product for tough deposits.
The other's are good for general cleaning or for "maintenance dose" treatment where a little is added to each fill up of the fuel tank.
The Berryman's might not be such a good product to use for a "maintenance dose" program.