Sorry - i should have gien the complete instructions, here we go then
logon to the esmith from your favourite term-emulator or the console and type the following
service squid stop (this stops the service)
squid -z (this rebuilds the cache and swap directories)
service squid start (this starts squid again)
hope this helps - let us know if it does - there are loads of threads that nefer seem to acknowledge or inform the next person if the info solved the Q.
Best of luck
Gavin