Steering wheel arrived. Thanks again Adam! Was very lucky to snag this up, it's no longer available. Came in the E46 ZHP 3 series as an upgraded option (I think). I've actually been looking for one of these for the ///M5 for awhile and could never source one. Definitely got lucky stumbling upon this one.
PN#32347906682
Cleaned it up this afternoon. Started with just some hot water and a applicator. Amazing what came off with just water. Then used a toothbrush and Gliptone cleaner around the entire wheel and stitching. Followed by Gliptone conditioner and amazing how it came out. Pictures aren't doing this justice, the lighting is terrible. I should have some better pictures once installed.
Before:
Hot water + applicator pad:
Scrubbing it down, section by section:
After:
