Amber - How to clean/clear it? Anyone familiar with crystals, etc?

IT may be getting darker due to the oils in your skin or perfume or lotion that you put on. Below is a link that has excellent information about caring for your amber. It can be washed with mild soap (like liquid hand soap) and warm water. If it gets scratched, amber is very soft in terms of stones and such then a jewelry can polish it. I work for a fine jeweler.