Clear Non-Essential Content from your Child Sites
MainWP Maintenance Extension allows you to: Delete post revisions Delete auto draft posts Delete trash posts Delete spam comments Delete pending comments Delete trash comments Delete tags with 0 posts associated Delete categories with 0 posts associated Optimize database tables To do that go to: MainWP > Extensions > MainWP Maintenance Extension and on the RUN NOW tab select your maintenance options, wanted child sites, after that click the Perform Maintenance button: