Oh please. There isn't anything that is going to be wrong with what Kay's Jewelers uses to clean your jewelry. Most mall jewelry stores clean with ultrasonic machine with a mix of water and ammonia.
Why not do it yourself? Use boiling water (or actually boil it in a pan) with a drop or two of dishwashing liquid. Let it "cook" for 30 mins and then rinse off with very hot water and blow dry up close with blowdryer. Only do this with diamonds and gold or silver.