IPA cleaner is a great chemical for use with general sign making. The alcohol based cleaner removes grease, silicone and films on substrates without leaving any residue at all.
Used for preparing panels and vehicles prior to installing sign graphics the isopropoanol cleaner is safe to use on the majority of the substrates and materials. Apply the IPA to a cloth and wipe over the area that requires cleaning, the fluid will clean, degrease and then evaporate leaving you a prepared surface to apply your graphics.