The answer to 'my deep cleaning is filthy' is that there are several common causes that can lead to a deep cleaning being excessively dirty or ineffective. This could be due to a buildup of grime, grease, or other stubborn debris that has accumulated over time, or it could be a sign that the cleaning methods or products being used are not adequate for the job.
Some of the most common symptoms of a deep cleaning that is not working well include visible dirt or stains remaining on surfaces, a lingering unpleasant odor, and a general sense that the space still feels 'dirty' even after cleaning. In these cases, it's important to identify and address the root cause in order to get a truly deep, thorough clean.