The best practice does depend on the application, for example a canvas would be treated differently to a truck curtain side.  For more delicate applications like canvas, photographic and other inkjet prints, we would recommend using a soft cloth or sponge dipped in a solution of warm water and mild detergent. Cleaning products for babies give good results due to their mild nature.

Truck curtain sides should be frequently cleaned otherwise dirt will build up.  There is a temptation to use abrasive scrubbing or solutions containing alcohol to remove the dirt which could compromise the Liquid Lamination coating and create a porous surface allowing dirt to build up easier afterwards.