Sorry mate, forgot about this one.
It literally just wipes straight off.
I always use kerosene to clean my chain, it doesn't damage the o-rings, and it's cheap. I just use a little butter container or similar, and a stiff bristle brush (toothbrush is a bit too small) to wet the chain, then leave it to soak in. Scrub it again and then use a small amount of aerosol chain cleaner to wash the excess kerosene off.
It does make a bit of a mess, but I just lay a sheet of cardboard under the swingarm when I do it. Obviously you need a rear stand to support the bike.