What is your viv's substrate ?
Sands and other particulates such as bark, wood chips, sawdust, gravel, coco fibres , peat, are all bad and are next to impossible to keep sanitized and soon become very sticky even if you remove poos diligently. So another reason along with the risk of an fatal impaction when beardie ingests some for NOT USING THESE as substrates.
Is the viv made from MDF or Particle board ?
Many use these as they are cheaper than solid timber or plywood , but the stuff literally soaks up moisture and becomes a perfect place for bacteria, viruses and moulds to thrive and they soon become very stinky and essentially impossible to sanitize (if they don't become crumble beforehand).
F10SC made up 1:250 in water and sprayed on to the surfaces will sterilize them , but nothing will help sanitize a damp wood chip viv where the germs have gotten into the structure of the wood.