Umm.... I didn't write the scrub tools - that's all Microsoft. What you could try is having a look in the Visio Premium install source. You should see a folder called something like VisPre.WW - that seems to be the identifier for the app like, PrjStd and PrjPro are Project. So then try this:
Execute-Process -FilePath "CScript.Exe" -Arguments "
Execute-Process -FilePath "CScript.Exe" -Arguments "
"$dirSupportFiles\OffScrub10.vbs
" VisPre /S /Q /NoCancel" -WindowStyle Hidden -IgnoreExitCodes "1,2,3"