It started out innocently enough; we were just going to repaint the guest room.
Then we decided that we should see what is under the carpet in there, because the carpet has all sorts of stains on it...
It doesn't look that good, but the black goo scrapes off really easily and you can see lovely wood gleaming through in some spots.
Then....we decided to look and see what was under the carpet in the hall, because we didn't see any black goo.
We decided it look weird to have carpeted stairs but no carpet in the hall. Giving ourselves a 'God hates a coward' pep talk, we pulled up the carpet on the stairs and found this:

