In general:

Laundry or washing machine. Only one down duvet or pillow at a time.

Temperature:

40° C or 60° C (as described on the label)

Washing program:

Delicates or coloured washing.

Detergent:

Liquid detergent, detergent for woollen fabrics or down. Do not use fabric softener.

Spinning:

Lowest level.

Tumble dry:

Lowest temperature 40° C to 60° C, with three clean tennis balls (to get a fluffy result).