Print adhesion on tank foil

we are experiencing that some of our parts failed in printing with High Temp. Now there is a thin layer adhering to the tank foil, but no parts inside the tank.
I will try to use the cleaning mesh and otherwise scrap them off carefully. But our tank might be unusable afterwards.
Any ideas or recommendations on this?
I need to mention that our Resins is overdue, bought in 12.2019.

I marked the failed prints:

Hey there!

Just for a little clarification, are the circled parts in particular the ones that gave you trouble?

Yes, they do. I already got some recommendations on issues due to their design and fixed them. But apparently, there still are some problems within.