"Bill" wrote in message
...
Left a large glass bowl sitting on a teak garden table last summer,
which unfortunately has left a dark 6" diameter stain on the table
surface, presumably as rainwater with the usual air pollutants has
run off the bowl and settled on the wood before eventually evaporating
away.

May not be a dark stain. It could be the rest of the table which has
bleached in the sun's UV.

luggsie