This is entirely something my mother would do and for that reason I moved to the other side of the earth to get away from her. She seems to have got the message and has now accepted her new boundaries with me. Now that I have moved back to the same city it is understood the only times she is allowed into my place is when I'm in the process of moving house. She may indulge in her cleaning obsession prior to any of my stuff arriving on site, or after the last box has left the building. So basically, when the building is empty. Any other time she cannot be trusted to clean something to destruction, refinish furniture when I'm not looking, or decide that the side of my desktop computer is really the best surface for my collection of super powerful rare earth element magnets (all been done). My brother isn't as good at putting his foot down and, although she is not sneaking in the house to do it, she is doing her best to decorate his new house through constant purchases of towels, drapes, rugs, lamps, tables, etc. Within 6 months of moving into an empty house, the place is bursting with stuff that he didn't buy. She has since moved on to the garden and is now planting shrubs.