Start by using a Film Rollers. These can be used to remove dry, unattached particles of contamination from a production process to increase yield and improve quality. The rollers are readily available from many PCB supplier outlets around the world, and come with an adhesive pad that traps the contaminates after use. These systems can be used on a regular basis, and are an excellent method for improving cleanliness throughout the process.

Once the emulsion has been clean rolled, the next stage is to use a liquid contaminate cleaner (if required). For cleaning fluids, it is best to use Isopropyl Alcohol (91%) or Heptane. Never use water, which will soften the gelatine, making it vulnerable to scratching. Important: When using Isopropyl Alcohol, 91% or higher is preferred because 70% is too "wet" and contains too much water. Water will swell the emulsion, making it even softer and more prone to damage.

Apply cleaner to cleaning wipe - squirt an approved cleaning fluid onto wipe – but do not dip the wipe into the cleaner, it should not be oversaturated (an oversaturated wipe should be squeezed and air dried until suitably damp for the wiping operation).

Wipe the film in a single top-to-bottom direction, working from one side of the film to the other. Note: Do not wipe the film in a "scrubbing" motion (circular or back-and-forth). A particle of dirt can be picked up and embedded in the wipe. This can cause severe scratching if wiping in a circular motion.

Turn and refold the wipe frequently to expose a fresh surface and to bury any particles that may have been picked up. Change wipes often - a single wipe should be dampened only once and discarded after cleaning an area no larger than 10 times its size.