I've always used toothpaste and an old tooth brushRinse with hot water and it looks great.
NoAnd anything with ammonia, such as Windex, will dissolve the silverDo not mix cleaners unless you know you shouldYou may safely clean jewelry with warm soapy waterSilver can be polished with silver polish, and a polishing cloth is the most convenient way to do that If you take a chemistry class, or know anybody in one, you are sure to hear about the baking soda/aluminum foil methodThat works, but it converts the tarnish to a powder, not back into jewelryThe powder will tarnish again very quickly unless you polish it off, which is what you should have done in the first place.
Basically, a solar oven uses energy from the sun to heat thingsIn order to do this effectively, you need to capture a lot of sunlight with a collector, and direct it into what you wish to heat (the oven)The collector should act like mirrors to reflect the sunlight into the oven and get as much sunlight as possibleAn easy and cheap way to do this would be coating cardboard pieces with aluminum foilThe oven should be no larger than you need it to be, because the larger it is the more area it will have to loose heatSince you want the oven to get hot, it should be absorbing the sunlight, and the best way to do that is with something blackClearly, there must also be a window for the sunlight to come in fromIn order to keep the oven hot by loosing as little heat as possible, it should be well insulatedI would suggest finding two shoe boxes, one somewhat smaller than the otherPaint the inside of the small one blackPut the small box inside the large one and then put foam between then for insulation(Sides and bottom) To make a window, you can use plastic wrap, and to make it better insulated, use a double layer, one on each box, making sure they don't touchNow, use your collector to direct sunlight into your oven, and see what types of temperatures you can get!
