FYI I looped heavy Zip ties , about 6 of them @ the reinforced areas Used a short 3/8 extension as a handle to carefully pressure/pop them up. A Couple pins were very stubborn, so I used a thin screw driver through the grille and twisted as someone pulled. No broken pins and all of the retainers came out intact. ( in my case it didnt matter but it didn't damaged the cowl paint except where I used a screw driver under the grille) Watch the elbow pressure
I wish I would have thought of using heat gun to soften the plastic , that method worked on many many other parts after the fact