3.2.5.2.2 Clean-Up Processing

A requestor IP/STS SHOULD delete any session state that has been locally cached for the web browser requestor that delivered the wsignout1.0 request message. A requestor IP/STS SHOULD send a wsignoutcleanup1.0 message to each relying party to which a security token has been issued for the web browser requestor that delivered the wsignout1.0 request message, as specified in section 3.2.5.3.<61>