I remember these times lol. If you have access to a quality sandblaster, sandblast it and jet wash it or rinse it out to make sure you get all the glass out
never sandblast it, the carbon should be soaked in cheap old kerosene and scrubbed.
too much chance for sand to get stuck inside a pcv passage and kerosene is like 4$ a gallon and a rubbermaid tote is like 10$ steal yer old lady's toothbrush, and an old water bottle with a few pinholes in the side for rinsing under pressure/stream.
100 pack of razor blades and change em often as they get nicked