Electrical injectors are somewhat self cleaning, in that any deposits get removed when the core moves as it fires. But there usually is no way to really clean injectors. Chemicals are not strong enough, and there is not way to get anything mechanic inside where is counts.
But you can tell how they are working, simply by removing them from the manifold, while still attached to the fuel lines.
(Careful not to cause a fire.)
Just crank the engine to see the shape of the spray.
It they are all the same conical shape spray, than they are all fine.
If one dribbles, is less, or shoots a sold stream, it is bad.
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