[GTALUG] (off-topic) bee nest inside brick wall

(off-topic) I have bees inside of exterior brick wall.  They are coming/going from the spaces between bricks.  Anyone had this?  And, how did you get rid of them? - University of YouTube and Google AI say to use "insecticide dust".  I couldn't find anything for bees locally, so I bought "ant killing powder" from Canadian Tire.  It's been 3 days.  Bees are still actively flying about. - I may have to resort to chemical spray.  There are 2 types of spray:  liquid and foam.  Is "foam" better for bees inside brick wall?