A few weeks back I ruined the top of the sideboard. There was a few watermarks. Alex Jones on the one show recommended mayonnaise to remove them. It left an even bigger mess than before.
Anyway OH sandpapered the whole top. Gave it three coats of wood stain and two coats of varnish or lacquer. It's taken three days to allow for drying time, and it looks really good. We were a bit worried about colour matching but it's turned out brilliant. So pleased with it.