The answer to 'window pet stains' is that the most common causes are pet urine, drool, and nose prints on windows. Symptoms include unsightly stains, odors, and discoloration. The best solutions depend on the type and severity of the stain.
For minor pet stains, you can often remove them with a DIY cleaning solution of warm water, mild detergent, and white vinegar. Gently blot the stain, avoid scrubbing, and rinse thoroughly. For tougher stains or set-in odors, you may need to use a commercial enzymatic cleaner designed for pet messes. If the stains are extensive or the window glass is damaged, it's best to call a professional window cleaning service to properly treat the issues.