[Evolution] removing old imap folders

["Brian J. Murrell" <brian interlinx bc ca>]

How can I clean up old cruft in ~/.evolution/mail/imap/<imap
account>/folders/*.

For example I have a file:

~/.evolution/mail/imap/brian mail domain 
com:993/folders/cur/subfolders/1110985922.M907598P28211V0000000000000900I008E81F7_16.mail.domain.com,S=2072:2,S/summary

which is obvious cruft.  There's tons more of that sort of thing though.

How can I safely clean these up?

b.