Months ago i removed the insert to see how it looks under.........Damn it !

Lot of accumulated dirt were under it,the drains were completely clogged as yours & one of the metal was off the insert; I didn;t had an idea to glue it back but use gorilla glue.

Then,to avoid gunk accumulating under the insert i placed soft weatherstrip around the edge on the hood where the insert goes & so far it has done a good job.