Logrotate or ???

[Cage <cage47@vonl.com>]

I've been looking into configuring my logrotate config to try to keep my 
/var/log directory clean. Thing is that my machine isn't on 24/7. From 
what I understand, logrotate is default setup to clean logs at 4 a.m. 
Which is rarely when my machine is on. So is there a way to invoke 
logrotate on bootup? Or is there another automated way to handle this. 
Or is it just a matter of manually going in and cleaning up the files?