Of course! All restraints have easy to remove covers (some covers can even be removed without having to uninstall the restraint, bonus!) It is recommended to hand wash where possible but they can also be machine washed on a gentle/delicate cycle, using cold water and mild detergent. The Vogue range of covers should only ever be hand washed/hand wiped.
The restraint itself can also be washed. Use only mild soap and water to clean all webbing, metal and plastic parts of the restraint using a damp cloth. Do not use chemicals or cleaning agents. The seat shell can be hosed, if a "deeper" clean is required, leave it in a semi-shaded area to dry and make sure to change its position occasionally to ensure that water does not get trapped in any of the crevices.
Use only mild soap and water to clean all straps, using a damp cloth the harness straps can be soaked, however they must be thoroughly dried without excessive heat (never tumble dry). The harness straps should not be placed in a washing machine as this may cause damage to the stitching or even damage your washing machine. Do not use chemicals or cleaning agents.