I recently found this video which shows an easy way to get absolutely every last bit of dirt and grease off a part and that is to use the part as a condenser of boiling solvent vapors
this person talks about it https://www.youtube.com/watch?v=HiL6uPNlqRw
this person talks about it https://www.youtube.com/watch?v=HiL6uPNlqRw