Most of the active ingredients in these injector cleaners are alcohols, and maybe some de-lacquering agent like Xylene..
Continuous use of the fuel should NOT result in any buildup as ACE points out - the toluene and xylene are powerful solvents - as well as flammable.
A little SeaFoam added to the fuel now and then has been doing a good job reducing carbon deposits in my Iron Barrel.
Singh,+1 on what SB said, if it needs to be cleaned send it to a shop that does that.
I have started a MSDS Composition Thread in Tech Tips that can help compare products based on their ingredients http://www.enfieldmotorcycles.com/forum/index.php/topic,9767.0.html
Here in Cali, our gasoline is just bad. We get a summer and a winter blend, the winter evaporates faster and is anywhere from 10 to 20% alcohol. Saying it's gasoline is a stretch. It's a poorly combustible liquid filled with odd chemicals.In our bmw's we started getting bikes hard to start, poor idle, and just running crappy.Pulling injectors showed flaky white deposits on the nozzles. BMW suggested we use the FI cleaner made for the cars that contains Thecron made by Chevron.Liquid magic. One ounce per gallon solved all our problems within a few miles.We now suggest it every few months.I checked the MSDS sheets on our product vs. the chevron branded stuff sold at auto parts stores and Costco.The BMW cleaner has 3 times the amount of Toulene than the other stuff.It also contains a gas preservative, an anti oxidant and an anti corrosion additive.For modern vehicles using the "film strip" type of fuel sender, this keeps things clean.It's about 15.00 per 20oz. Bottle so it goes a long way.it's approved for carby bikes as well and helps keep the pilot jets and passages clean as well.Again, we Cali folks have a unique gasoline issue.Sorry for the long post.BA