Removing thin film off door

I’ve a recently fitted aluminium front door that has a thin plastic film on and is proving to be a bit difficult to remove.
It’s coming off in 5p sized bits at best.
Any tips?

Hair dryer to soften up and should just peel off.

Tried that but still won’t shift?

Heat it up until you can lift a corner then put the air direction under the bit you’ve lifted and gently pull.