Like furniture, the door must be periodically service and then you will save it for a long period.
For cleaning doors, you should use special tools specially designed for polished surfaces. For this purpose, you can use the following solution: 90% water from the water supply and 10% alcohol. First, moistening in the solution and squeezing a rag well, wipe the doors from all sides with it and remove the dust thus. After clean all the traces of moisture with a dry cloth. It is strictly forbidden to use even by accident, both abrasive powders and detergents that can chemically interact with the wood of the door, thus accelerating its aging.
If during the repair you cannot, having removed the canvases from the boxes, transfer them to the closed room, then we can recommend covering the canvases and boxes with a plastic film or timely remove all stains of plaster and paint from the door, and dust, using a rag, soaked in soapy water.