Not sure if this is the right place to put it or not, but I have an account right now with bees/wasps. I have discovered a least one nest that is underground. It is neccessary to remove them because the opening is located in a bed I wanted to put mulch on, and the customer is less than thrilled about them being there. What is best spray or killer to get rid of them? Should it be done after sundown when the bees are less active?