eliminating smell in older house renovation

[Lee Stephenson]

I am renovating an older small house. The house has an 'off' smell, I suspect from years of renter traffic and who knows what. There is nothing obvious creating it, I've been under the house. I'm wondering if anyone has any advice about how to get rid of this? Thank you!

[Joe S.]

A commercial strength Ozone machine has worked for us on a couple of properties.