In the dishwasher please! The "StandArt" glass is made with the latest glass technology and is lead-free. This prevents blue discoloration, milk cloudiness and scratches. Please refrain from using tabs and liquid detergents containing chlorine. Both are aggressive and attack the surface of all glasses. For perfect results: In the dishwasher please. Wash in the upper rack at a slight angle and with the normal rinse program (we do not recommend the glass program as it does not dry properly). We use Sun powder and Sun shine, so we always have brilliant glasses. From now on, do not wash by hand - this is yesterday's news with Gabriel glass. And if nevertheless: polish your glasses with our Clara cloth - you will be thrilled. Conventional dishcloths are not suitable, because the leverage effect during polishing is immense and therefore there is a risk of breakage, even if you have the feeling that you have been very careful with it, besides, fibers of the cloth usually stick to the glass.