The answer to 'window cleaning smells bad' is that the smell is usually caused by a buildup of dirt, grime, and chemicals on the windows. This can happen over time as the windows are cleaned with various products, and the residue accumulates. The smell may also be due to the cleaning products themselves, especially if they contain strong fragrances or harsh chemicals.
To address the issue, you'll want to thoroughly clean the windows using a mild, non-toxic cleaner. Avoid using ammonia-based products, as these can contribute to the unpleasant odor. If the smell persists after cleaning, you may need to call in a professional window cleaning service to deep clean the windows and remove any stubborn buildup.