def clear_cache(host_url=None):
CACHE.clear(host_url)<EOL>
Clears the file cache of the specified host or the complete cache if host_url is
    not specified.

    Can be useful if the original style file has changed but an old version is still
    available in the cache. Alternatively you can call any of the frontend methods
    (get, use, temp) with the optional `ignore_cache` parameter.