overflow in var file system | clean squid log files and squid cache

/var file system can overflow for the following reason:
# Are you using squid?
If so,
1. clean squid cache using the command : rm –rf /var/spool/squid/*
2. clean squid access log using the command : rm –rf /var/log/squid/*
Before cleaning, stop squid service using the command: service squid stop
OR killall -9 squid
Then start squid service using the command: service squid start