It seems the P4 plugin is blocking requests to wipe out workspaces in Jenkins. Unfortunately, this is a necessity in some instances.

The other Perforce plugin for Jenkins (https://wiki.jenkins-ci.org/display/JENKINS/Perforce+Plugin) will allow workspaces to be wiped, and then automatically does a force sync of the full p4 workspace on the next build.

This issue and JENKINS-24025 are the only things blocking me from rolling out this P4 plugin across our build farm. In my testing of it thus far, it does seem to work better overall.