Cleaning carbon rim brake tracks

Had a bit of a nightmare on (what should have been) a long ride yesterday. It was wet when I went out but not raining, however a torrential downpour started and my LB carbon rims (ultegra rim brakes, black prince pads a couple of months old) didn't stop me at all. Anything over 3% downward slope meant the bike wouldn't slow and more than that it accelerated with brakes on full. The rims feel very shiny, what can I do to clean them?

Clean with something like Mucoff (or favourite bike cleaning product) rinse well, rub pads and brake track with isopropyl (rubbing) alcohol to be thorough

I think unfortunately braking in these conditions is just a bit shit. I'm too prissy to plan a ride in the rain, but when it's happened rim brakes/carbon rims braking power is way down. On top of the above, inspect the pads to check there's no grit stuck in them. Had this recently and scored a nice channel in one of my wheels :/

Accelerating while you had the brakes on full sounds pretty scary. Has anything like this happened before, and what is the braking like in the dry?

Braking is fine in the dry usually; we're not talking disc brake level obviously but enough power to lock the wheels up. Never experienced it before but the conditions were genuinely awful; the rain was as heavy as anything I've ever ridden in before.

Going to clean up the rims and pads and go for a ride at lunch time to see how it all feels. I think the alloy wheelset will go back on for winter though.

Sounds like every carbon wheelset I've ever ridden in the rain. Once the rim warms up a bit, they work better, but generally all carbon rims are shit in the wet

Carbon = disc brakes. Tried to moderate speed going down Gravel Pit Hill (Oxted) on a fixed bike with single front brake, on was a hot day, ended up SQUEAAALING down the hill. Rubbish. Generally it's been fine, but always have enjoyed the fact that as it's a fixed bike I have an alternative way to scrub speed, or even stop at a push.