the previous owner of my hornet just didn't care for it the way he should have. don't get me wrong, it's tidy, but the pipes are FILTHY!!! they're a hideous browny yucky colour. by comparison, the pipes on my CB250 are sparkly clean! any tips on how to restore these pipes to their original shinyness?? I'm not talking about the exhaust (i'll be replacing that) but the pipes coming out the engine. what products/methods are safe to use to get that shine back?