I have just had a look at about 10 different sites for cleaning old flags.
The consensus is for slightly soiled flags, gentle detergent or wool wash by hand is the go. No wringing or spinning just lay out to dry.
Almost every site said the best thing by far to get old flags as clean as possible without damage is dry cleaning. They stressed you should tell the dry cleaner it is a "special" so it is done individually like Christian Dior $10,000 dresses.
In the USA most dry cleaners do USA flags for free but I doubt our cleaners will be so patriotic.
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