I had a riding day from hell and caked my entire bike in thick red clay/mud. I take care of my DID 520 O-ring chain ($110) meticulously and I was quite upset after this ride. My drive from the trail was about 2 hours to which I immediately hosed the chain down as best I could and sprayed with chain lube. The chain was completely covered in rust. I soaked it overnight that same day in Mineral spirits (out of Kerosene) and that didn't seem to help. WD40 and a brass wire brush seem to do the trick on the outside links, but I am unable to get every corner on each internal link. Is there some chemical out there that will cut this rust out and not ruin the O-rings? Something that I can soak for a couple hours and spray it down with compressed air? If I spend all day on the chain with the wire brush and WD40 I might get most of it clean but I'm looking at a much more efficient method. Thanks! PS - Any other methods to get caked mud off metal/engine parts? Simple green did a decent job but I'm hoping for other opinions. Diesel/Kerosene?