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@fredtc
mine (rain jacket) reproofed perfectly. wash first with regular detergent, then wash with grangers 30 degree proofer (the stuff you put in the washing machine, not the spray on), then tumble dry, but not too hot. It doesn't work without the tumble dry, and if you iron instead of tumble dry I find I always miss bits then the the wet gets in here. I'm also sure the Rapha spray on is rebadged granger spray on.
I also used the same technique to reproof my gfs softshell which now appears to be waterproof. not as waterproof as my rain jacket but better than it was before.