Anyone bought used rig with musty smells or dog odors?

A word of caution on ozone units: yes, the can get rid of smells that other cleaning methods can't reach - but ozone is an oxidizer and works the same way that chlorine and bromine do. And like those products, it can fade fabric colors; plus it makes rubber and vinyl brittle.

A little bit can help - but too much can cause damage. AND is really hard on your lungs - so don't hang around if one is working in the RV....

I forgot to add that it also rusts steel.....