The importance of cleaning the glass properly is to ensure the highest performance and the highest transmission of light. There are three steps to the cleaning process. Each part should be done in sections of the window. Smaller windows should be separated into 2 sections, larger windows 4 sections. Scroll down to watch cleaning video.
*Lighting while cleaning: Best option is to shoot white light out of each projector so you can see what area of the glass the direct projector light will be traveling through. You can also see all possible dirt due to the high light output. Turn off projectors prior to cleaning and turn them back on for quality check after cleaning is complete. It is recommended to use a flashlight while cleaning so if streaks are made while cleaning, they will be seen while cleaning vs. after the projector light is turned on.
Warning! Never look into the light coming from the lens of the projector, this can be very harmful When working in close proximity to laser projection systems, make sure you have all proper certifications required to do so.
Depending on how soiled the glass is, repeating steps one through three may be necessary. Do not use soiled cleaning cloths. If the window is very dirty then the cloths can become fouled during a single cleaning. After a successful cleaning it is a good idea to wash the cleaning cloths (or obtain new ones) and have the cloths along with ample cleaning supplies available for the next cleaning.
(1) Spray bottle of Isopropyl Alcohol
-Available at local drugstore
-70%, 90% & 99% acceptable*
*higher percentage = quicker evaporation
(2) 100% Cotton Cloths -Make sure cloths are totally clean
STEP 1: Dust
Use cloth 1 to dust off glass. (Reason: the same way a dusty shelf needs to be dry wiped before a liquid is used to clean, so to the glass needs to be dusted off. This avoids turning the dust into streaks on the glass.
Step 2: Spray & Wipe
Spray 4 or 5 sprays of the 70% Isopropyl alcohol on the section you are cleaning. Fold the second cloth in half or in quarters so the surface will be evenly cleaned. Wipe sprayed area with folded cloth. Use consistency in wiping, stick with up and down or side to side, don’t switch it up mid clean. Apply a medium amount of pressure when scrubbing.
Step 3: Dry Wipe
Immediately after finishing step 2, take the 3rd cloth and use it to wipe up the dirt that is left over from the step 2 cleaning. It is important that this step is also done in the same direction and done across the full distance of the section you are cleaning. If you are having trouble getting the full piece of glass to be streak-less, make sure the area where light will be projected through (the light footprint on the glass) does not have any streaks.