cleaning treasures found in freshwater

I live in Kansas and am new to detecting. The state is draining a lake near my home and I have been finding some very nice jewelry. My question is how to clean the pieces safely? (gold and silver). Some of these pieces have been in the water a very long time. I would appreciate any help on the subject. Thank you

• Re: cleaning treasures found in freshwater Steve 16:56:17 10/15/99 (0)
• Re: cleaning treasures found in freshwater Bert,Miami 17:55:03 10/04/99 (1)
  • Ammonia/Emerald caution Chet 08:17:48 10/05/99 (0)