Remove vCAC 6.0.1 plugin from vCO 5.1.2

I installed vCAC 6.0.1 plugin by mistake in vCO 5.1.2. Now I am trying to remove vCAC 6.01 plugin. I removed the .dar file, and removed the vCAC package from vCO client. After vCO appliance restart its still doesn't remove the vCAC library workflows and actions. This is causing issues if I have to add a new vCAC host or do any activities. I would like to remove all vCAC 6.0.1 components and install vCAC 5.2 plugin. Any help ? Thanks.