About five years ago I put eight double packets of Black Cat firecrackers in a small Pelican case (one of the smaller cases, with the transparent plastic lid) and forgot about them. I found them New Year's Eve and me and some friends set them off in the back yard (expired firecrackers are always a good time). I now have a new case I'd like to put dupes of various electronic accessories and cables in. I was going to scrub the case out and put stuff in it, but I'm worried there will be residue from the firecrackers that would make my life really difficult if I ever traveled with any of the gear I was going to store in the case. Does anyone know how likely it is that I'll get popped at security checkpoints? Is this something I should worry about? How should I clean the case out, or is that impossible?