but most time I ride I would get my pants tainted with the black lube or dirt, and the pants get wrinkled at the knees and crotch. Wonder how the Dutch [do] it.
Mostly by not having 10, 15... 20mi commutes one way. Seriously, it would be rare to by cycling more than a couple of miles to work i that part of the world. I have a minimum 7 mi commute each way but it can go to 10 mi one way if the weather is good and I take the back roads. Either trip is too long for work clothes so I cycle in shorts and/or tights and appropriate tops. I have a garment pannier so I take each days clothes fresh to the office. I have changed clothes in the bathroom at work but I prefer to use the facilities in a building across the street where I have access privileges. I can also keep my bike there in an unused storage room. I'll really be sad when this arrangement comes to an end as I will be looking for a new employer in a few weeks.
H