I removed shower caulk and see lots of brown particles. Is this water damage??
I own a condo that was built in the 1940s. The tub is the original. I removed some caulk in my tub in order to re-caulk it. There is a small layer of brown dirt-sized particles behind the caulk in the seam. It is easy to vaccum up.
Is that a sign of water damage done to the walls behind the shower?
Should I just re-caulk it and forget it? Or is it a sign of mold?