You can clean your gold-plated jewelry with the same method as cleaning gold jewelry (see How to clean gold jewelry). Gold-plated jewelry is costume jewelry, and is not as durable as a solid gold piece of jewelry. It is made from a base metal and coated with a very thin layer of gold, which can wear off.
Gold-pated jewelry should not come into contact with harsh chemicals or jewelry cleaners, as these can wear out the gold-plating.
Always keep your gold-plated jewelry away from body lotions, hair sprays, and other cosmetics, as they make the pieces appear dull. Do not scrub heavily or bring it in contact with abrasive materials, which may wear off or scratch the gold coating.