How does the LTM cache my site and how do I flush it?

Here you are (only a portion of the output, as it was too long):

 list ltm profile web-acceleration xxx_Web_Acceleration
ltm profile web-acceleration xxx_Web_Acceleration {
    app-service none
    cache-aging-rate 9
    cache-client-cache-control-mode all
    cache-insert-age-header enabled
    cache-max-age 86400
    cache-max-entries 10000
    cache-object-max-size 2000000
    cache-object-min-size 0
    cache-size 100mb
    cache-uri-exclude { /owa/ev.owa uglobal.js oab.xml }
    cache-uri-include { .* }
    cache-uri-include-override none
    cache-uri-pinned none
    defaults-from /Common/optimized-caching
}

(tmos) show ltm profile ramcache xxx_Web_Acceleration Ltm::Ramcaches xxx_Web_Acceleration
Ltm::Ramcaches /APPLICATION/xxx_Web_Acceleration

Host: server_xxx
URI : /owa/14.3.146.0/scripts/premium/blank.htm
-----------------------------------------------
  Source Slot/TMM  1/0
  Owner Slot/TMM   1/1
  Rank             1

  Size (bytes)     476
  Hits             5956
  Received         2013-09-01 14:13:56
  Last Sent        2013-09-02 01:53:18
  Expires          2013-09-02 14:13:55
  Vary Type        none
  Vary Count       1
  Vary User Agent  none
  Vary Encoding    none

Host: server_xxx
URI : /owa/14.2.342.3/scripts/premium/blank.htm
-----------------------------------------------
  Source Slot/TMM  1/0
  Owner Slot/TMM   1/1
  Rank             2

  Size (bytes)     503
  Hits             2083
  Received         2013-08-30 08:34:17
  Last Sent        2013-08-30 13:59:01
  Expires          2013-08-31 08:34:16
  Vary Type        none
  Vary Count       1
  Vary User Agent  none
  Vary Encoding    none

Host: server_xxx
URI : /owa/14.2.342.3/themes/resources/owafont.css
--------------------------------------------------
  Source Slot/TMM  1/0
  Owner Slot/TMM   1/1
  Rank             3

  Size (bytes)     5128
  Hits             1642
  Received         2013-08-30 08:34:06
  Last Sent        2013-08-30 14:02:11
  Expires          2013-08-31 08:34:06
  Vary Type        none
  Vary Count       1
  Vary User Agent  none
  Vary Encoding    none

Host: server_xxx
URI : /owa/14.3.146.0/themes/resources/owafont.css
--------------------------------------------------
  Source Slot/TMM  1/0
  Owner Slot/TMM   1/1
  Rank             4

  Size (bytes)     5101
  Hits             1416
  Received         2013-09-01 14:15:02
  Last Sent        2013-09-02 01:53:09
  Expires          2013-09-02 14:15:02
  Vary Type        none
  Vary Count       1
  Vary User Agent  none
  Vary Encoding    none


Host: server_xxx
URI : /owa/14.3.146.0/themes/resources/logon.css
------------------------------------------------
  Source Slot/TMM  1/0
  Owner Slot/TMM   1/1
  Rank             5


  Size (bytes)     3227
  Hits             1333
  Received         2013-09-01 14:15:02
  Last Sent        2013-09-02 01:53:14
  Expires          2013-09-02 14:15:02
  Vary Type        none
  Vary Count       1
  Vary User Agent  none
  Vary Encoding    none

Host: server_xxx
URI : /owa/14.2.342.3/scripts/premium/flogon.js
-----------------------------------------------
  Source Slot/TMM  1/0
  Owner Slot/TMM   1/1
  Rank             6
  Size (bytes)     4519
  Hits             1329
  Received         2013-08-30 11:24:53
  Last Sent        2013-08-30 13:59:01
  Expires          2013-08-31 11:24:52
  Vary Type        none
  Vary Count       1
  Vary User Agent  none
  Vary Encoding    none