The type of material your orthosis is made of will determine how to clean it. If your orthosis contains a lot of Velcro material, you will most likely be advised to use mild soapy water on a sponge, wipe it down and let it air dry. Do not submerge Velcro underwater.
If your orthosis is made of a plastic material, you will most likely be able to use mild soapy water on a sponge to wipe it down, rinse it, and let it air dry. Your Orthotist will give you instructions on how to maintain your orthosis.