[Focus-SE]

Ive been working on rust on the body of my other car. Some of it could just be surface rust from the guy driving it in the winter.

If it's serious rust you can tell easily by using a solvent rust cleaning chemical, if the rust is still there than it's really bad and you have to either work long and hard at it.. or have a professional do it.

My advice is tell the guy selling it to find out how bad the rust is by applying some chemical to where the doors are.

He can easily pick up some stuff at Canadian tire.