Yup, dirty jets are just beginning. Need to disassemble emulsion-tubes and floss out every single bleed-hole with wire of matching size. That will push out plastic plug about size of grain of sand. I like to verify cleanliness by dripping dye (Kool-aid or FDA red #3) through and checking that every single hole bleeds properly.
Basically follow complete path of petrol from tank to cylinder, ensuring everything's clear along way. Jet is just start of journey.