Re: anybody use diesel injector cleaners?
As stated, your best bet is filters and the correct ones for your engine.
Another is high quality fuel. The US standard for diesel cetane is 37 +/- 2.
Diesel engine makers today require 45 cetane. Read the manual. Use a cetane boost for optimum fuel burn.
DO NOT use diesel cetane boosters that contain alcohol. Read the label. Alcohol has NO lubrication qualities and will make short work of precision injectors.