Redex Injector Cleaner Anyone Know Where I Can Buy The Stuff You Spray Into Spark Plug Holes For De-coking A Bike Engine?

Anyone know where I can buy the stuff you spray into spark plug holes for de-coking a bike engine? - redex injector cleaner

A few years back (waaaay back in early 1980!) Coking I remember one of my 1st Class with an aerosol spray in the spark plug hole, replace the spark plugs the next day and the engine is running in a batch of carbon / carbon black exhaust.
I have a bicycle on the need to house, good, clean, but I am not able to overcome it, I hope that "something magical" sounds like someone who knows where I can buy?
I often use Redex in my fuel injectors to keep clean, but also the inner parts of the engine (as determined by the outlet) are seen too smoky for my taste.
Any help would be great
Thanks
Steve