Use powder not liquid detergent.
Run a 60℃ programme every week (eg for towels). No need to run a special programme with empty drum.
Don't use fabric conditioner.
Add a slurp of disinfectant to the final rinse via the conditioner compartment.
Dry the seal and inside the drawer compartment (pull the drawer out completely) and leave both open for several hours. Leave the door ajar as much as possible.
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