what should i use to clean the fuel injectors on my car? the outside of them. they have abunch of black oil looking crap on them.

 

with them still on the engine? maybe acetone in a spray bottle, or contact cleaner/ brake care, both will evaporate fairly quickly before damaging anything...
you should be more worried about what the INSIDE looks like

 

oh i am more worried about that lol. but no they are off the engine and very dirty.

 

oh.. and both the primary injectors are exactly the same right?