So I’ve attached a photo of these floors from a restaurant we clean for. The owner asked if we’d be willing to handle this task for him- pretty much I said that we would try. The only tool we have that I think might help is our steam cleaner. What’s your advice folks? How would you tackle this one?
Since this is restaurant grease and you know it's thick because of how black it is, I would suggest Dawn heavy duty Degreaser it's a like a purple liquid you can find in hardware stores and it's what most commercial restaurants use to clean the tile floors in the kitchens -like when I worked at Pizza Hut or Sonic Drive-In. But I can't really say that I know how it would react with a wood floor so if you do try it I would test it out to see if it's going to strip away Waxing or seal or something like that. Good luck to you