There is some good information regarding cleaning and disinfecting mattresses if you click the related link I added to your question.
Disinfect
clean, disinfect
u cant clean a thick down mattress
dry cleaners
You can disinfect it by wiping it down with a disinfectant wipe.
You wash the item with clean, hot soapy water then rinse or wipe clean afterwards.
Run it through the washing machine set on "hot".
With a wet paper towl and rubbing alcohal to disinfect it
Alcohol
Yes, there are some mattress pads that are dry clean only, but they are usually specialzed pads.
Chlorine kills bacteria their for it will clean and disinfect your pool or hot tube
washed, purified