Thx Rani for your suggestions. I called Johnson but the sales seemed not professional enough in answering my questions. Also sometimes blunt. Poor English speaking.
For mattress cleaning, I don't prefer to use household cleaner coz it can't go deeply to extract the dust and dust mites. Also no sanitizing effect at all. I used a very comprehensive cleaning system in my own country that made my allergy gone. I eventually found a cleaning service provider that provides similar cleaning services from Internet. Though I haven't tried it yet, the sales/customer service can answer me professionally and politely. I may try this one. Anyway thanks a lot.
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