Brifter flush...
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I don't know much about brifters, but I now have a set of Shimano 105 5500 Flight Decks.
(Interestingly, I'm gathering the group before even having a frame to put it on!)
I read about flushing with WD-40, and then using Tri-Flow, but don't know exactly how to do it.
Squirt while advancing and...