Ok you probably get me saked as a Carpet Cleaning Moderator but the rival site is another forum
I think Johns piece ran to a full A4 page,
To summerise
You need a Hunter Homtek Vac to remove all dry soil on both sides of matterss
It is important that you througly vac.
Then you apply stain removers etc
And Clean Matterss with HWE machine preferably with a CFR tool but this is optional.
Try not to overwet Matterss . You should also apply Dustmite protection there are several product available from various Cleaning Chemical companies.
Turbo Dry
I think John uses two drying the matterss on its side.
John goes into a lot more detail
Hopefully others will add more .