We bought a new build 2 years ago, and the walls of the stairwell are looking pretty shabby/filthy thanks to the DCs, and the cheap white paint. I’ve tried washing the walls, but it just removes the paint. I was thinking a stain/silk paint would be better for the stairwell, as it washes better? Or is matt paint still preferable, and in which case how do we stop it looks so grubby so quickly?