How to remove plastic trim on tailgate

I gutted a deer on the tailgate of my truck. Lots of blood. It went down not just below the liner panel, but into the locking mechanism recess and then into the plastic trim piece that runs along the top of the tailgate. I have put so much water in to try and rinse it out, but there must be a lot and it must have coagulated. Every time I try to rinse it and think I have it all, I go out the next morning with blood streaking down my tailgate. I can see the plastic anchors that hold this piece on, but they don't look like they will reinstall well. Has anyone ever taken this piece off? Thanks for the help.

 

https://images.simplepart.com/images/parts/motor/fullsize/8194840.png

I'd start with taking off the black top plastic and the inside of the tailgate to get at the inside. I'd think pulling that piece would require taking apart the handle and wiring.

 

BAM here it is...
https://youtu.be/SJGVZ_yurbw?si=WC4j6GNnOQwdcoCM

This will help you take the tailgate apart and clean it out...
https://youtu.be/5Ckb7O7xSEc?si=qqEwNQA-y_CKgbUA

 

Thanks for the video! I think I see now why it is not rinsing well, with all those little separated compartments in that plastic piece.