Objective: Removing spray paint from concrete

Which of the following solutions is more sound in terms of naive physics reasoning?

(1). Apply nail polish remover to the painted surface.Cover the remover with sand paper. Use a pressure washer to remove the gel.Apply masonry cleaner to porous surfaces after stripping.
(2). Apply paint stripping gel to the painted surface.Cover the gel with plastic wrap. Use a pressure washer to remove the gel.Apply masonry cleaner to porous surfaces after stripping.
(2).