[cloud_firestore] Delete Firebase cache files

[fe-data]

I'm on
firebase_core: ^1.3.0
firebase_auth: ^2.0.0
cloud_firestore: ^2.3.0

My App works fine. It's opening multiple Firestore Databases at runtime, does some work and then closes 1 or more instances and never uses it again, opens another new instance, closes, ..... and so on.

Again this works all fine.

But if I look in Device File Explorer there are 2 (mysql) files per instance in the cache. This list keeps growing. Is there a way (API call) to delete those files as well. Right now I cancel the snapshots, terminate the instance and delete the app.
snapshot.cancel(); instance.terminate(); app.delete();