Camp beds one has some rusty stains (St Just TR19)

Two cotton camp beds , tubular frame slots together. Plastic carry bag . One has rusty stains from the metal ends on some of the pieces getting onto the rolled up fabric when stored . These are quite old but canvas seems strong . Metal seems sound also although sadly a bit rusted from being stored with some damp air . Would give a fun project to put together and sleep in den or tent etc. Haven’t tested myself or don’t remember .