I have seen a lot of great DIY carpenter bee traps that fill up with bees. I have friends that say the traps keep them out of the house.
https://www.pinterest.com/explore/carpenter-bee-trap/
1) Fiberglass tubs are notorious for getting hairline cracks that usually open up when someone is standing in it with the water running.
2) Also it might be a leak from upstream (plumbing behind the w ... read more