This morning, presumably as a result of Saturday's drenching, my bike was squeaking a lot on the ride to work. By the time I got there, I'd just about pinned it down to "something in the front wheel".
I didn't get around to doing anything to it at lunchtime, so it was still squeaking on the way home. But, at a T-junction on the cycle path, I wanted to turn right, while another cyclist coming from the blind corner to the left also wanted to turn right -- result a low-velocity collision as our front wheels met.
We ascertained that no damage had been done, and cycled off. A hundred yards or so later, I realized that the front wheel was now running quietly again! So, no need to try haphazard lubrication and hope.