cummins isx injector

[race7820000]

What would you use to clean up the injector cups? Like a brush of some sort ? Or is that a big no no?

That was the only injector like that. The rest were clean in that area, except for the tip were is sprays,a cpl of them were Carboned up so bad I don't know how it was spraying.

Would the broken spring allow fuel to be dumped in all the time? Or would it make it not dump enough?

Thanks