I would use compressed air in conjunction with the parts cleaner to push as much out of the birf as possible. Or do repeated plunges in parts cleaner then compressed air. YMMV
I had number for him and reached not too long ago but did not receive a response. I have an outlet to make these drawers via a cousin with a wood CNC machine and I thought about buying him out and attempting to make a GO of manufacturing. Margins are too slim and demand too low.
Sure wish I’d...