Question about Miele Blizzard CX1 Parquet PowerLine

Yes, you can do this with the dust container and fine dust container. It says so in the manufacturer's instructions for use:

Clean the hoover and accessories only dry or with a slightly damp cloth. Exception:
- Dust container/fine dust container: Clean these parts only with water and mild detergent. Dry
dry them carefully afterwards.

The filters can also be washed with water.

Yes, it is very easy to dismantle the dust container and the fine dust container, clean them thoroughly with plenty of water, let them dry for several hours and then reassemble them without any problems - easy!

Yes, you can. For the fine dust container, it is explicitly pointed out that it must be dried properly when cleaned with water. So let it dry for 24 hours before the next use.