This article should help: https://www.hunker.com/12344488/how-to-clean-very-dirty-hardwood-floors
Walmart carries a wood floor cleaner called Bona.
Vacuuming and using Bona.
We have had hardwood floors in our 7 different homes and have used a lot of HW floor products over the years. We stopped using the steam mop when it started blistering off the finish at the seams on a new traditional oil based sealed oak hw floor installation.
The past two years we have been using the BONA mop and solution and we’re very pleased with the results.
Than you , never heard of them.