How can see what is in the Auto-Whitelist
In the tools sub-directory of the SA tarball is a tool called "check-whitelist". This will dump your AWL contents, although you'll need to manually tell it what AWL db to dump.
It's also got a --clean option which you can run to have it clean out all the "once only" entries from an AWL db.
how can I selectively delete from there is it possible.
spamassassin --remove-addr-from-whitelist