These materials are quite durable, and could withstand a mild solvent. A too-strong solvent, or too much cleaning, can wear down the film and affect clarity, however. Pollution Graffiti isn't the only hazard prints encounter in urban areas. Vehicle exhaust and other airborne pollutants can damage prints, eat away at the adhesive, coat the laminate, and obscure the image. Preventing pollution damage involves encapsulating the image well and using high-quality film.
Good encapsulation keeps the pollutants out the print, where they can discolor the paper.
Tedlar, which is polyvinyl fluoride, resists just about anything and could last 20 years without breaking down. Regular cleaning with a light solvent is about the only way to combat the build-up of pollution on prints. Scratches Prints located in high-traffic areas are going to be abused by passers by. If preventing scratches and abrasions is important to your customer, try laminating the image with a tough material like polycarbonate film, which goes by the brand name Lexan. This costs more than regular film, but will easily resist scratches.