How can you determine if a windshield is contaminated?

Determining if a windshield is contaminated can effectively be done by spraying glass cleaner around the bond area, which helps reveal any contamination by creating a distinct linear pattern. This method works because certain contaminants can create inconsistencies in how the cleaner interacts with the glass surface; for instance, dirt, grease, or other residues may lead to uneven streaking or areas where the cleaner does not spread evenly.

Using this method allows technicians to visually identify problematic areas that may affect the bond between the windshield and the vehicle structure, which is crucial for ensuring safety and structural integrity. The distinct linear pattern formed by the cleaner highlights areas of contamination that could impede proper adhesion or sealing, guiding effective remediation steps.

Other methods listed, such as examining for physical scratches, measuring glass thickness, or checking for air bubbles in the adhesive, do not directly indicate contamination. Instead, these methods may focus on different aspects of the windshield's condition or installation but do not specifically reveal the presence of contaminants that could affect the bonding process.