<VV> Windshield washer concentrate bottle cleaning

[George Jones]

I have one of the triangular bottles that is supposed to hold the
concentrate for the windshield washer. It has sat for many, many years with
just a little bit of the pink concentrate left in it, and I am trying to
clean it. I've tried using a bottle brush with any number of
solvents/cleaners to no avail. Anyone have any ideas on what can remove the
pink stain on the inside of the glass bottle?

Thanks,

-- 
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George Jones
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Tidewater Corvair Club (since 1987)
Central Virginia Corvair Club (since 2006)
Corvair Society of America (CORSA)(since 1987)
'65 Monza Crown V8 Convertible
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'66 Monza Coupe Custom (in progress)