Water leaking into trunk appears to be coming from back window

I have a 2017 Prius 4. I found water in the trunk so I had a friend spray the hatch with a hose while I sat inside the back. The water appears to be coming in though the back window which is under the spoiler. I can see it running out from under that plastic bar on the inside that sits between the upper and lower glass. Does anyone know how I can get the spoiler off so that I can seal it up? Or is there a better method to fix the leak? I am having trouble finding much in the way of instructional videos online. Thanks!

 

Since no one commented on this I just came back here to say that I got the spoiler off using some helpful instructions I found for the Gen 3 which I tried to include a link to but apparently I am not allowed to do that. Then I found a hairline crack in the channel just above the lower rear window which I sealed up with some silicone. No more leak!

 

I don't know why it posted two of each photo. Sorry!