Miele DGC 6300 Operating And Installation Instructions page 124

Cleaning and care
Coupling seal
 If, after prolonged use, the water
container becomes difficult to remove
and replace or the fault message 
appears, rub a small amount of the
silicone grease supplied (see
"Overview - Accessories supplied")
into the inside of the coupling seal.
Do not take the seal out to lubricate it.
Misuse of silicone grease!
Remove any silicone grease from
your skin either by wiping it off or by
washing it off.
If the grease gets into the eyes, it
must be rinsed out with plenty of
clean water.
If it is swallowed, seek medical
advice.
 The coupling seal should be replaced
with a new one if it becomes brittle or
porous or if an unusually large
amount of water collects on the floor
of the water container compartment.
Coupling seals can be ordered from
Miele (see the end of this booklet for
contact details).
124
Only use the silicone grease
supplied. On no account must
margarine or oil or any other
domestic grease or fat be used, as
these can cause the seal to swell.