Removing white ring water marks on polished wood. The stain is caused by trapped water underneath the surface which needs to be dried out. Cover with a plain dish-towel and then point a hairdryer over the towel 15 cm from the stain for ten to fifteen minutes, rubbing every so often with a soft cloth.
Another tip is to soak a cloth or slice of bread with a 50:50 mixture of turpentine and linseed oil, put it over the stain and leave overnight.
I used the above hairdryer tip and then added a little teak oil on a soft cloth. Lo and behold, two very nasty, heavy marks came out like magic! The obvious thing to say, of course, is that I could easily have prevented the marks with just a little forethought. A hot milk jug and a coffee percolator aren't likely to improve a veneered surface any time soon! Fontes
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