Advice needed from sword collectors

[Finn]

Using a polishing compund will help. Oiling it should clean it up; but, if the blade is that cheap, those water stains are an early indicator of corrosion and future problems.
Painter's tape should protect the blade, and easy filing and/or hammering will reduce the nicks & gouges.
A leather point guard will protect it when not jabbed into the ground.

[Joe Gondek]

I like oil and 0000 steel wool
also a scotch-brite pad works well