There are numerous 'polishes' that claim to restore stained wood - however they rarely do what they say on the tin, to coin a phrase...if the stain feels rough to the touch then I'm afraid the grain has lifted and a complete repolish is necessary to make it perfect. However if you ring up a good furniture store they will have 'experts' at their finger tips who could give you better advice than me as they do this all the time....I have a similar problem but 'er indoors' hasn't seen it yet :)
John
April 2008