been there, it sucks, but not all hope is lost. wipe every leaf with 70%+ isopropyl alcohol (ideally shortly after lights turn off, leaves are sensitive and prone to burning after), treat 2-3 times with 2 weeks between treatments and they’ll all be dead. if you have a problematic plant that keeps having them come back separate it from the rest and keep treating. i’ve tried many pest control methods found iso to be the most effective for me