Hint: To put labels inside car windows or on glass (windows)  where you want the label to be read from the outside, you must print on the clear static cling, in "reverse" or "mirror" so your image/text reads correctly from the outside of the window. Then spray the printed side of the sheet with a white window masking spray.

However we strongly recommend the Ultra Cling for this purpose as static cling can sometimes fall off glass surfaces that are subjected to intense changes in temperature, such as car windows.