Cleaning stainless steel billies

[Globetrotter.uk]

I've been using billies for a while now and usually give them a good clean after use before travelling home, and then wash them at home before putting away. Recently I've noticed the inside has become discoloured. What would you recommend to clean them.

 

[Graham_S]

Personally, as long as it's clean I leave it.
It's oxidation patina.
If it bothers you, wire wool or wet 'n dry is your best bet.

 

[rik_uk3]

Graham is right, don't sweat about it, won't kill you.

 

[ged]

I use a stainless steel scouring pad. Don't use things like Brillo pads which will leave particles of mild steel which will cause rust damage to the stainless.

 

[Dexter]

Cleaning the inside with a handful of wet sand works wonders.