***CAUTION - THIS IS DESTRUCTIVE***
/opt/ibm/InstallationManager/eclipse/tools/imcl uninstallAll
/opt/ibm/InstallationManager/eclipse/tools/imcl uninstall `/opt/ibm/InstallationManager/eclipse/tools/imcl listInstalledPackages`
/opt/ibm/InstallationManager/eclipse/tools/imcl uninstall `/opt/ibm/InstallationManager/eclipse/tools/imcl listInstalledPackages`
***CAUTION - THIS IS DESTRUCTIVE***
It may also be necessary to clean up what IIM etc. leaves behind e.g.
rm -Rf /opt/ibm/WebSphere/
rm -Rf /opt/ibm/WebSphereProfiles
etc.