There is no scientific evidence to suggest that apple cider vinegar can clean gold. However, some people swear by using it as a homemade jewelry cleaner. To try it, mix equal parts apple cider vinegar and water and soak the gold for several minutes before scrubbing with a soft toothbrush. Remember to rinse and dry thoroughly before wearing. As with any jewelry cleaner, it is always advisable to spot-test in an inconspicuous area before using the entire piece.