mould is caused by lots of LOW temperature washes do a service wash at 95 deg NO CLOTHES ADDED but a good dose of NEAT BLEACH once a month.
You could wipe the door seal with NEAT BLEACH but if the mould has eaten into the rubber a new seal is needed . If you fit a new one when the wash is finished WIPE OUT THE EXCESS WATER leave door slightly open along with the soap drawer to create a A-I-R F-L-O-W
wirecutterman
August 2008