When to Clean or Replace fuel injectors

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Fwiw- No fuel injector issues with either one of my 100s and i don’t use any fuel additives. Both over 250k miles now.
 
Never tried b12 for injector cleaner but we use it at work on the Audi 3.0T for oil consumption issues, it helps to clean/free up the rings.
As far as injector cleaner I'm a big fan of Redline SI1 or Techron.
 
I've used 44K, Chevron Techron, Seafoam, CatOclean, etc. They do a good job of cleaning fuel system, cylinders/pistons/valves, spark plugs, A/F & O2 sensors even CATs.

But none tells us anything about spray pattern, flow rate cold/hot or leak down of fuel injectors.
 
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