easy spark plug cleaning Q

Sorry i did not read you allready had it.
In that case use walnut media. I had one years ago, but was afraid of glass beads and fine sand i might not get all out, even after lots of air. So never used it with sand-glass. It worked well. I gave it away. If i can not do a fast easy clean with solvent like brake clean and a brush i just toss new ones in.
If ya have it already just shy away from glass-sand.