I don't know if a topic already exists, I would like to ask for advice on a detergent to clean the soundboard after having removed the dust with the appropriate spatula.
Dear James, generally the soundboard is not very accessible unless the strings are removed. In this case, a light polish is fine. If the strings remain, you can lightly dampen the spatula with a cleaning liquid, like the one used for glass. It dries immediately and removes the dust stuck to the varnish well. A little patience is required. Work in small areas and go over them again to dry. Be careful not to wet the strings, obviously