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.
Any ideas on how to tackle the stain? Hopefully it is only on the surface and will not necessitate vigorous sanding, which I am loathed to do for fear of making even more of a mess. Have already tried simple cleaning with garden furniture cleaner and then re-oiling, but no joy.
TIA