Sascha, a little tip. When the cleaning crew comes, it's usually two Turks who are paid a flat rate, for house Sascha they get sum x, however long it takes you, your problem, it should be Q2, so when they come, be there, give each of them 50,- in hand or 100,- if the house is very big, and say, we don't want wallpapering, make an effort and try to get close to Q3. No matter what the sqm sanding costs, it will never be more than 200,-. Karsten