API to manage cached information

Does Subversion have any API for managing the information it caches in the
runtime configuration area? For example, suppose I have cached guest
credentials for some repository, like (http://svn.collab.net/repos/svn).
Now I get commit rights and want to supply new credentials. Is there an API
that could delete the cached credentials for that repository? If so, could
that API be exposed to JavaHL? If not, would creating an API like this ever
be considered? It seems like GUI clients would all benefit from having such
an API.

-- 
Thanks
Mark Phippard
http://markphip.blogspot.com/