logrotation and removing old logfiles

[atomicmak]

i have just reapply logrotate policy to store only 3 monthly logs per domain.

now i want to remove my all old logfile stored on server on each domains.

nebody can help me on how can i remove old logs in all domains ?

going through plesk interface one by one domain>logmanage> remove files is really hard to work on 500 domains.

please help