I'm an amateur classical musician lucky enough to live in an area that has an amateur orchestra. We're performing this Sunday and since I'm meeting with friends tomorrow evening I devoted tonight to making sure that my clothing and instrument were ready to go.
My tux was recently cleaned so I set about dealing with equipment. I spent about an hour cleaning up the cello then pulled my bow out and remembered that the silver fittings really needed attention. A bit of google-fu said that toothpaste could substitute for silver polish in a pinch.
After actually trying it, my mind was blown. It wasn't exactly the best result but the tarnish that it had developed over the last 13 years was gone and it now looks quite bright,
TL DR: If you need to polish silver in a hurry, toothpaste really does work