Re: Dumb Questions
Don't boil mouthpieces. A soft scrub in lukewarm water, soap, and then maybe a soak in a sanitizer solution or alchohol is what most recommned. If they turned brown, then they are asthetically ruined, but may still function properly.
soft cloth would work well for wiping down the horn of old dirt, soot, etc.
As for the pads, visual inspection may not be enough. The horn could have leaks and other problems. Both horns are very much worth the cost of competent repairs by techs experienced in working with professional instruments.