That is no longer a good idea. Cans now have a plastic liner (BPA) and putting them over a fire is not a good idea.

Originally Posted By CamperMom
+1, Gershon!

Yeah, soaping pot bottoms is an old-time method of making soot clean-up a bit easier, and yes, pots are still messy with soot, soap or no. For some a fly-drive-camp vacations, I've planned to cook over a fire and just packed a few saved cans. Carry in repurposed plastic shopping bags and toss at the end of the trip. Done!

CM