@flyingfeather
Brother I am personally of the opinion that if fuel injectors get clogged, and need to be cleaned, then instead of such chemicals, the fuel injectors rail(s) be removed, and then injectors removed, and cleaned one by one via appropriate methods.
However, everything must be done by someone very expert, as fuel injectors cleaning cannot be compared to like, cleaning spark plugs, etc. (fuel injectors are quite sophisticated), and it must also be ensured that nothing (like debris, dirt, any nut / bolt, etc.) falls in the spaces from where fuel injectors have been removed, otherwise, havoc may be caused to the engine.