If they are not firing a nice cone, then you will quickly see. When they are firing a nice cone, depending on the light, you sometimes have to look closely to see it. So, if you were having trouble spotting the pattern, I suspect they were nice fine cones - almost a mist. When they go off, you see streaks of fuel. Easy to spot.
Have no experience of injector cleaner in the fuel tank - never used it. Sorry.
Alan
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