The previous answer is incorrect for my Dishlex 100.
To replace the lower door seal:
(a) Open the door completely.
(b) Lean inside the cabinet and remove the 5 phillips head screws holding the seal on the bottom edge of the door.
(c) Remove the front panel of the door by unscrewing 4 screws on each side (you don't need to undo the screws at the top holding the control panel), and disconnecting the earth wire.
(d) Close the door, which increases the gap between the door and the cabinet, and push the old seal into the dishwasher from the front.
(e) Clean the years of gunk buildup on both sides.
(f) Install the new seal and replace the 5 screws holding the seal.
(g) Reattach the earth wire to the door front panel and replace the 4 screws on each side of the door.
(h) Remind your wife how much money you saved doing the job yourself and receive your hard-earned reward ;-)
Kim Parrott, February 2010