With a damp cloth. I don't know why. I spent part of the night outside (where I am not allowed apparently!). I rolled around in the dirt and made my white furs all gray. You might say I have 50 shades of furs now!
When I wanted to come in, I went to the bedroom window and meowed. The first meow didn't get much action, but the third one did. Mom poked her head outside the window and said "So you are outside!". Then dad came around the corner and grabbed me.