FAQ > Customer Glass Knoxville's Finest Auto Glass Installation Center • I already have the auto glass, will Phoenix Glass install it for me? Yes, but due to economics Phoenix Glass cannot assume responsibility for breakage of your new or used glass.  Also note that if  we do not provide the glass to you directly from an auto glass manufacturer or one of our authorized OEM or OEE After market  auto glass distributors we cannot warranty the glass itself.  Also please note that due to job cost considerations we do not offer  this service for mobile on-site installation, we provide this service only IN House.  It is highly possible that the bonding surface maybe unstable or contaminated.  Contamination can come from many sources  and can consist of one or more substances.  It is difficult if not impossible for an auto glass technician to accurately identify the  contaminant and know of any special treatment procedure for removing it.   This was and remains a problem even on "new auto glass".  A used glass that has been out in the world for a number of years,  and removed by who knows what method from a vehicle, has even more hurdles to over come.   Surface contamination is and always has been an on going problem in the auto glass industry.  In 2003, after a lot of  extensive research, Dow Automotive implemented a working solution for the problem on “new” glass.  Dow's mission was  to define the types of contamination and provide a practical solution that is effective on a wide range of contaminants and  safe for the auto glass technician doing the actual work.  Dow concluded that the contamination could be classified into  one of two types, "primary" or "secondary" and that both could be effectively treated by the technician using materials  typically on hand in any properly equipped auto glass installation center.  Most contamination can be classified as  "primary" contamination that is the direct result of the manufacturing process or shipping from the manufacturer to the  distributor's warehouse.  Dow developed a "wet scrub" procedure for "new" auto glass parts a technician can use that can  virtually clean and make just about any "new" auto glass part usable.  Secondary contamination, is typically the result of  handling or transporting the glass part and is easily treated with a good "commercial" glass cleaner such as BETACLEAN  GC 800 Glass and Surface Cleaner from Dow Automotive. In 2004 Dow Automotive released the "wet scrubbing" procedure to the technicians in the auto glass industry.  This  procedure uses a mist of BETACLEAN GC 800 that is applied to the bonding area of the glass that will produce an  indication of existing contamination.  The GC 800 will usually indicate a contaminant is present on the glass by separating  or "fish-eyeing".  If this happens the glass bonding area is cleaned and tested again by reapplying the GC 800 to  determine if the contaminant was removed.  If the GC 800 does not separate when reapplied, the contaminant was likely  a "secondary" contaminant and was successfully removed and the glass in now ready for the application of the adhesive  system.  If the application of GC 800 continues to "fish-eye" a "primary" contaminant is likely present and more GC 800  should be applied to the bonding area and it should be lightly scrubbed with a non woven abrasive pad.  After that  process, the glass part should once again be re-cleaned and reinspected.  If an auto glass technician "wet scrubs" a piece of glass more than three or four times and it does not appear that the contaminant is removed, Dow recommends that a new piece of glass from a different manufacturer should be used. By the later half of 2008 Dow Automotive has had nearly five years of proven results with this "wet scrub" process and it  is still being supported by continued testing and well over a million installations.  • Guidelines for installing Used Glass There are major safety pitfalls you should be aware of that come into play when installing a customer’s used or new auto glass part. The term “used glass” can be defined as a part that has been previously installed.  Each piece of used glass must be  evaluated on a case by case basis.  The AGRSS Standard requires that the part be free of flaws, compatible with the new  adhesive system and have a traceable path to the previous installation information.  The adhesive manufacturer has  specific bonding requirements to insure a safe, quality installation.  The used part can ONLY be used when all questions  about it are answered, and the part meets BOTH adhesive manufacturer AND AGRSS Standard requirements.  The chart below is the standard that all reputable auto glass companies and their technicians are supposed to follow.