I have four stacks of clothing in my apartment that upon reaching a certain height tells me it's time to wash them.
To elaborate, artificial things are things that are not made of natural things. Things like nylon, plastic, Cool-max, etc. Most of my running gear is composed of artificial things.
I also have a section devoted to special things. These things are taken, whenever the spirit moves me, to an an old lady or some Asian people who dry clean them. I have no idea how they clean these special things without water, but they always come back clean, ironed, and wrapped in plastic.