I had related to Stuart that the interior walls are of matte paint and the cleaners mus be meticulous not to drip any water /cleaning fluids on them or else they will leave a mark. ( we had just had some walls repainted ). I advised the 2 cleaners individually who came to do the job the next day and offered to provide towels. ( they declined since they had brought their own and indicated that Stuart had already communicated with them regarding this issue. However they still dripped water / cleaning fluid on the walls and the floor( which I mopped up after them) . they did do a wonderful job on the windows though. We had many window and some difficult to reach. I would still recommend them , because without the matte paint . The droplets will not have mattered as they could be wiped off easily without leaving permanent marks on the walls.Their price is very good too. the two cleaners were highly efficient and professional.