soak warm soapy water or goo gone and then using a fingernail or credit card.
Taking a razor blade to soft plastic is not a reasonable idea. Sure if you are supremely careful you might make it out ok, but it's a completely unnecessary risk.
Antihero
Putting AMS garbage, and $500 ebay wheels on a Z is like dressing a Victorias Secret model in a Walmart dress and Payless shoes. You're embarrassing yourself.