In short, there are two methods for cleaning fabric covers:
Spot Cleaning Only
The fabric cover can only be spot-cleaned on stained areas and cannot be fully removed for washing. This is indicated by the Cleaning Code.
Please see "Cleaning instructions for unremovable fabric" for more details.
Machine Washable or Dry Clean
The fabric cover can be entirely removed and either machine washed or dry cleaned, as indicated by the attributes Washable or Dry Clean.
Please see "Cleaning instructions for removable fabric slipcovers" for more details.