Final answer:
When spray cleaning with chlorine, the solution should be at the manufacturer's recommended concentration to ensure effective cleaning while minimizing risks.
Step-by-step explanation:
When spray cleaning with chlorine, the solution should be at the manufacturer's recommended concentration. This is because different cleaning methods require different concentrations of chlorine. Spray cleaning typically requires a lower concentration compared to immersion cleaning. The manufacturer's recommended concentration ensures that the cleaning is effective while minimizing any potential risks.