Not a chemist but found this.
Silver Nitrate (AgNO3)
Like most good ideas the best thing to do is to wash any glassware as soon as possible afterwards and wear protective clothing so that the silver nitrate does not get on your skin. Having said that some proposed solutions have included;
One proposed solution is to use "Silvosol", available from Rotec Scientific in Milton Keynes. It is quite expensive though lasts along time.
The use of Iodine followed by Sodium thiosulphate to remove stains has been found to work also.
Soaking the item in