Uninstall Avast 7 at startup

Does anyone have the parameters for the latest version of aswclear.exe? I recently had a lot of issues automating the uninstall of Avast 4.8 from over 1000 machines. The console method proved too unreliable and we needed to be sure it would be done at start up. I finally managed to get it to work using the below command:

aswclear.exe /verysilent /prod " & “av_net”

I am now wanting to prove that we can do the same with version 7.0, if we need to in the future. However I have found that with the latest version of aswclear I am not able to use these parameters. It works if I do it manually, but no matter what parameters\switches I use I am not able to suppress the message asking if I want to do it in safe mode and then either nothing happens, or it just opens the GUI. Have the parameters changed in the latest version and is there any other way to remove Avast at start up?

Cheers