my cousin bought a Wheeler mountain bike a few years back. he used to take so much care of it but has recently lost interest. he said he'd give me the bike for free I haven't seen it yet. he said he left it out in his balcony last winter...what a genius!!! but says it still looks ok. however, he noticed that some parts of the frame are spotted with rust. is this fixable? i know i could take it in for a full tune-up but i'm just worried about how well i could get rid of the rust spotting.