I use panel cleaner on mine, which gets all the **** off. Use it onec you have washed and dried it as per normal.
Panel cleaner is obtainable from any car refinisher supplies place, it us used to do a final degrease before spraying. It also works a treat to get those stubborn stains off the bodywork
Used to do the polishing thing with my pipes ( Ohh err!) But now prefer the brushed look. Just use a nice scotch bright etc. Cleans em up a treat and leaves em looking sort of factory.
auto glym products are great there super resin polish is the nutts for the body work and there alloy wheel cleaner cleans about every road going turd off anything and it dont react on anything (only ur throat) they do a motorcycle deegreaser to to get the stuburn chain flick off the wheel and pipes that u sometimes get there pretty exspensive but its all worth it