Does anyone have experience with these pests? We noticed them all over our walls on the outside and window sills :( online a lot of companies suggest they can be impossible to remove yourself as they grow huge in numbers and hide in cracks. I was hoping a spray would do the job but we don't know how long they've been around or the extent of the problem . So far haven't spotted inside. It's making me paranoid about leaving windows open but it's so hot!