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J C 1947 J C 1947 is offline
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There is a technique for demisting providing the inside of the glass has not been stained. The method is to drill two small holes at oppposite ends of the diagonal, then a moisture absorbent fluid such as methanol is pumped through and after drying to fit a small valve in each of the holes to let the unit breath. Mr Demister is a company in Dorset that offer this service at £40 per window. Just tried it on one window waiting to see what happens.