To clean vases or decanters or any other piece that you can’t reach inside of, fill them halfway with warm-to-hot water and a few drops of dish soap. Add 2 tablespoons of white vinegar or ammonia. Then add 1 cup of uncooked rice. Swirl the mixture around to clean the inside of the piece. Rinse it out with warm-to-hot water and then set it upside-down to air-dry. For tougher stains, fill the piece all the way with warm water. Add a denture-cleaning tablet. Wait for the mixture to remove the residue. Rinse the crystal thoroughly and set it upside-down to air-dry. [3] X Research source
Be aware that excessive washing, usage, and age may affect the acid stamp’s visibility. [5] X Research source If you find none, have the crystal examined by an expert to authenticate it.
