The chain on my 05' Bonnie is DISGUSTING. It seemd the dealer was able to clean it pretty good a while back when I took it in for service, but I can't seem to get it REALLY clean like some I've seen.....What's the trick? I bought one of those three-sided chain scrub brushes and went to work on it with the lncluded oil they provided, and it cleaned it up a bit, but it still doesn't *shine*....Tricks? Tips? Thanks in advance.