Where was option #5 - light it on fire
When I have junk I've swept off the bench I have a ceramic bowl I'll put it in, the boys get a kick out of me hitting it with a butane torch.
Safety Brief: We're talking like 0.3gns of powder here, in the middle of the concrete drive way only on nights with no wind and 17 fire extinguishers handy, the fire department is actually already there supervising, and we have a 17-minute pre-fire briefing. I feel like this needs to be said because people on the internet terrify me.