How would you scrape gunk off an oak hardwood floor without damaging it?

Question

Our tenants recently moved out, leaving a great mess, but the worst part is there's black gunk all over areas of the oak hardwood floor. We've tried using Citrisolv and a gentle scrub brush, which works well, but takes a long time for a small area. Scraping the gunk off is much easier and takes less time, but can damage the floor. Does anyone know a good way to scrape without any damage?

Answer 1

Use a stiff plastic putty knife - Try WD-40 and a rag,

Answer 2

try some WD40 it does alot of things or go to wd40.com