Don't forget toc flick the switch to manual and wash cycle - otherwise if the delime chemical mixes with the chlorinated detergent, you will get a real burning sensation in the nose and lungs - not good.

They make a deliming solid and a liquid (liquid Chisel) and the solid one is in a little plastic tub you place it on a rack and it disolves inside the machine I belive you can buy them from ECOLAB hope this helps
PS: if using the liquid wear gloves and goggles it is caustic