Commuting on the Trek tour bike this week. The old cantilever brakes aren't very efficient from on top of the hoods, so to try and optimize them I changed the angle of the transverse cable, and got new salmon-coloured Kool Stop pads and now they shriek like a banshee. I washed the rims with soap (but not with abrasive or degreasing cleanser) which didn't help, and I haven't had time time to do the next steps yet - a better cleaning, sand the brake pads, toe them in, etc.