For jewelry items that are made of hard metals and won't scratch easily, you can use the following homemade jewelry cleaner. First, mix 1/4 teaspoon mild liquid detergent and warm water into a medium size bowl. Work the water and detergent into a good foam with a spoon, then gently brush the jewelry with a soft toothbrush while it is in the suds. Rinse the jewelry with warm water and pat dry with a soft lint-free cloth. Microfiber works great.