I have a co-worker I'll call "Eric". Yesterday, I got to see his bikes (he has 4) at his place. He has a mtn bike (main) in the garage and 3 in the backyard. The last 3 seem to have been there for a while exposed to the elements. They all have rusty chains and I'm sure flat tires.
Today we got to talking about them. I told him he'll probably have to replace the chains (or is it possible to save a rusty chain?). He says he can WD-40 the heck out of it and it'll be as good as new. I told him I thought it would probably work, but that WD-40s a degreaser and it'll have to be cleaned off afterwards and then lubed. He says he's been riding bikes for years and WD-40s all he needs (he probably sprays his whole bikes w/ it).
What do you guys think? How can you un-rust a chain? And is WD-40 not good for a bike in any way?