hmm, okay, so i must done it one by one right ?
using the chemical one.. i'll try that.. cause my car is reall worked hard in its life time.. hahaha...

 

I should point out that ultrasonic cleaning of exposed surfaces works well but when shrouded not so good. The parts of injectors that needs to be cleaned are the bores and valve tips and only disassembling the injector has much chance. The chemical bath doesn't care as long as it reaches the contaminants. At least ones it can dissolve.
good luck.