What precaution must be taken when preparing to clean the aircraft canopy in cold weather?

When preparing to clean the aircraft canopy in cold weather, ensuring that the cleaning solution isn't too cold is essential because extremely cold solutions can cause the polymers in the canopy to harden or become brittle. This could lead to scratching, cracking, or other types of damage during the cleaning process. A warmer cleaning solution is better as it can more effectively remove dirt and debris without causing harm to the canopy material. Additionally, using a solution that is too cold might not clean the surface efficiently, making it less effective in removing contaminants. This precaution helps maintain the integrity and clarity of the canopy, which is crucial for visibility and overall safety during flight operations.