Elements Air is dishwasher safe and heat resistant up to 450 deg. Celsius. If you use Elements Air on penetrative techniques like smoke firing, barely, pit and wood firing, cleaning the functional wares in a dishwasher is complete safe. If you use Elements Air on a shallow carbon signature technique like Obvara, is its not recommended to clean the wares in a dishwasher. Simply use a soft sponge and a ph neutral or phosphate free  dishwashing liquid.
Elements Earth is dishwasher safe and heat resistant up to 300 deg.Celsius. Elements Air can be used on SMOOTH surfaces of all no-glaze techniques, and have been successfully time tested in a dishwasher on OBVARA( a shallow carbon penetrative technique)
All Elements Ceramics & Design's functional ware in the Obvara technique is sealed with Elements Earth and is dishwasher proof. PH Neutral, environmentally friendly or phosphate free dishwashing liquid and powers are recommended to ensure longevity of your Obvara pieces.
The wares may be used gently in a dishwasher. Please see the info about dishwashing liquids and powders as well as the Elements Air and Elements Earth FAQ's for more information.