psexec.exe -l (to the begining of the command) c:\windows\system32\RunDll32.exe InetCpl.cpl,ClearMyTracksByProcess 4351
i.e.
psexec.exe -l c:\windows\system32\RunDll32.exe InetCpl.cpl,ClearMyTracksByProcess 4351
Reference
http://www.winhelponline.com/blog/clear-ie-cache-command-line-rundll32/