Which cleaning chemical should never be mixed with another chemical at the station?

• A. Do not mix cleaners with chlorine bleach or other incompatible cleaners due to toxic fumes; follow SDS.
• B. Any cleaner can be mixed freely.
• C. Only water should be mixed with cleaners.
• D. Bleach can be mixed with ammonia.

Answer: (A)

Never mix cleaning chemicals because certain combinations release toxic gases. The best guidance is to avoid mixing cleaners with chlorine bleach or any incompatible cleaners and to follow the Safety Data Sheet for each product. This matters at the station because even small mismixes can produce fumes that irritate or damage airways. A classic dangerous pairing is bleach with ammonia; mixing bleach with acids can also release chlorine gas. Keep products separate and only mix as directed by the label or SDS. The other statements give unsafe or overly broad guidance: not all cleaners can be mixed with water, and mixing bleach with ammonia is specifically dangerous.