I live in an old farmhouse that collects a lot of dust. When I try to clean the dust with a damp cloth from the base of the toilet bowl or any ceramic surface, it turns into a particularly annoying mud that spreads streaks everywhere, but is almost impossible to wipe away. All wiping does is just spread it around. Do any of the engineers here know why this is? Dirt on my desktop or other smooth, shiny surfaces wipes up with ease, but not from porcelain. Why is this so? Are there any solutions?