The reason for rust on the drum is that foreign objects made of iron have been in the machine and created a coating of rust.
Rust on the drum can be avoided by following the instructions in the user manual. (If you do not have your user manual, refer to Where can I find the user manual for my appliance?).
- Ensure you remove all metal items from your laundry.
- Button up cushion covers, close zips, attach hooks, and lock snap fasteners. Do up belts.
- Empty pockets and unfold clothing.
- Use a laundry bag to wash small and / or delicate items (e.g. underwired bras, belts).