I have read some people say they like white sheets, like hotels, because you can bleach to remove stains.

Spray it with bleach and clean with soap and water.

I found the ozone treatment to work pretty well but if really bad you have to remove the carpet and either paint the flooring or if it's a slab house with cement then bleach the cement floors.

And be aware that you cannot kill mold by just cleaning it with bleach, you may have to replace the drywall in that area.

I cut out the drywall removed insulation and spayed the damp area with bleach.

Costs vary a lot by area, so best to have it inspected and if there is a problem with it, find out replacement costs and ask the seller to pay for it.For use, it is similar to one connected to sewer (don't flush anything other than human waste and TP down the drain), but you need to be careful with chemicals that they use (eg no bleach) and have it pumped regularly (frequency depends on usage).

White linens = bleach = clean.

wash paint with soap and water. even bleach. nothing's cheaper.

If you are interested, HERE is an article that explains why these types of products work, and why simple cleaning with detergents, vinegar, hydrogen peroxide, bleach, etc., will not do the job.This also works on mattresses, carpeting, and fecal stains.

A fire extinguisher and bleach.