I'm not sure what sort of maintenance is needed, if any. I bought a second hand Aluminium storm kettle and I've used it a fair bit now. The inside was pitch black. It's not bothered me, but this morning I took it down to the beach to boil water for coffee for the family on the gas cooker I was using to cook the bacon, sausages and eggs. It seemed to take a very long time to boil and I think it might have something to do with the soot build up inside.
I started cleaning it before thinking to take a photo, so imagine the entire inside as black at the worst part you see here:
I scrubbed it by hand with steel wool and was slowly working the soot off:
I left a little on but stopped at this point because I don't like scouring the Aluminium with steel wool - I'm not trying to thin the inner wall after all.
I recall someone saying they wipe something inside the kettle to make the soot wipe away easily after use. Not sure what that is though.
Does anyone know what other maintenance these kettles need? Should I de-scale the inside chamber or just leave it?