Why is it that yellow is the universal colour for gathering muck. Of all the cycling attire that I have all my yellow hi-viz stuff has some form of dirt or oil on them. Yesterday I got dirt all over my new yellow s/s cycling top on it's second outing. The only other cycling top that has oil marks on it is my l/s yellow top. Is this some kind of cycling law? A bit like the wind always being against you no matter what direction you go, or there being a big hill just round the corner when your about to collapse from exhaustion?