5er is not difficult to remove so you should remove that asap.Otherwise it can collapse with any new wave of snow. Shovel it off. To automate this process you can use some snow blower or leaf blower. i would recommend Snow Joe SJ623E or Stihl BGA 85
In my opinion Vacuuming the duck is best option for you. The vacuum will eventually suck the bugs. Additionally you can also use any powerful blower for this purpose. Chose any professional and powerful blower/vacuum for this purpose like Hitachi RB2...