if you are not a citizen or current resident of Saudi Arabia, according to the US State Department, you cannot get a police clearance.
"Police clearances are unavailable for third country nationals who no longer reside in the Kingdom."
http://travel.state.gov/content/visas/english/fees/reciprocity-by-country/SA.html
For as much importance as CIC places on police clearances, you would think the information they provide would be more comprehensive and current.
If you find it impossible to obtain the PCC, you will have to write a letter of explanation. You can cite the above information. But it will still be important to contact your consulate in the KSA - try to get their response in writing (email is good), to show evidence that you attempted to follow CIC's instructions.