Probably the remainder of ingredients that your grandparents can't easily recover using a spatula should be ignored and discarded.
Vita-Mix™ Corporation makes a series of expensive, high-quality models of machines which come with a choice of two blades specifically for wet (marked W) or dry (marked D) ingredients. Dry blades for grains can make flour.
The wet blade is standard and is appropriate for most things. Your grandparents are most probably using the wet blade.
UNLIKE other brands, Osterizer®, Sunbeam®, etc. the Vitamix® machine blades do not need to be removed for cleaning so disassembling the extremely sharp blades from the base is not a casual effort. It probably should be discouraged to get whatever stuff remains in the blades.
According to the Vitamix® machine Owner's Manual IMPORTANT SAFEGUARDS (page 4, #12) … A rubber scraper or spatula may be used, but only when the Vitamix blender is not running.
NOTE: A rubber scraper/spatula is the only kitchen utensil mentioned in the whole series of owner/instruction manuals provided by the manufacturer.
BTW; If the original has been misplaced, all of the manuals available for each model can be found and downloaded as PDFs from the manufacturer's website.