Six steps to wash only the IKEA NORDSTÅLÖRT pillow cover
For 205.602.84 the removable cover is machine-washable up to 60°C, while the foam insert must not be washed.
Original IKEA instructions for NORDSTÅLÖRT cover versus foam
Link to official foam and removable-cover guidance
Open source ↗Separate the washable cover from the nonwashable foam. Do not soak or spray cleaning liquids onto the insert.