There are a few things you can do to clean a faux fur rug if it has been in use for a while. First, vacuum the rug thoroughly. This will remove any dirt, dust, and other debris that may have built up over time. Second, use a mild soap and water to clean the rug. Be sure to rinse off any excess soap before returning the rug to its original condition. Finally, dry the rug completely by using a dryer set on low heat.