Can Lift Off Spray Foam & Silicone Caulk Remover be used on vinyl windows to remove caulk?

Yes, Lift Off Spray Foam & Caulk Remover was formulated to remove dried on caulk from vinyl surfaces. However, we always recommend first testing for color fastness. Rather than spraying it on, it would best to brush on Lift Off so that you have an even distribution (on top of and around the caulk). Let it set for upwards of five minutes; then use a scraper to work under the caulk.