Yea. Always good to have some brake clean to spray round to keep things oil free.
Learnt that from refrig. Nothing worse than chasing your tail on a potential leak that doesn't actually exist anymore.
If I was you i’d go on partsouq and grab all the gaskets/seals/o-rings for the intake and replace the lot. Shouldn't be too expensive. New injector O-rings aren't a bad idea either.