Hello I have got a Bosch Exxcel dishwasher. I

Hello I have got a Bosch Exxcel dishwasher. I have recently noticed that when the cycle finishes and I empty the dishes, they still have food etc on the surface. I have also noticed that the cycle is not completing properly and is running really slow. I put a cycle on the other night and it was still running six hours later. The dishes are also coming out wet upon opening. Can you help.