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I have had similar 'noise' after riding through puddles, for me it was that one side of the caliper was very close to rotor. Although I had pads aligned so they weren't catching, crud that was getting onto on the caliper from puddles/being thrown off the pads/rotor, on the side the rotor was entering was catching/making the noise, rather than anything on the pads. Shifting the caliper over a bit helped. Hope this makes sense.
I tried but I think the pad wear was uneven and I couldn't be bothered faffing, needing to ride home so put them in properly.
Yesterday's ride was hours of listening to stuff get caught in the caliper and make horrid grinding noises. Is that normal? I mean, I understand horrid noises when actually braking but just riding along, hit puddle, now caliper sounds like a traction engine that someone has dropped a bag of bolts into the middle of.