Ability to delete logs on v-series appliances

I need the ability to clean out the logs myself.  I had to call support to do an upgrade from 7.8.2 > 7.8.4 (I use a V5000G2) because there wasn't enough disk space on the box.  Yeah it was my bad for leaving full logging on (surprised this didn't crash the thing to be honest) but having to call in, on a weekend, was a hassle.

Thanks!