Taking the bindings off or loosening the screws is completely unnecessary. The reason you see the wax spots is two fold. One, the metal of the insert pack acts like a heat sink and the wax cools and solidifies here first. Second, if you have gone apeshit tightening your bindings down, it will pull up the base a tiny amount under the binding and if you use a scraper the wide way, it will miss this concavity and leave a film of wax. Simply use the scrapers narrow end to scrape here and presto! Wax gone.
Trusted advice from the wise wolf. I am sure many others have heard or learned this old school way but when you get to doing something a certain way sometimes change isn't easy.