[dalek1967]

I don't know what kind of phone you have but on my android phone, I can go to the app in settings, tap storage and tap clear cache at the bottom. There is also a clear data but if you do that, it resets back to the way it was when installed. It deletes username/password etc. Usually clear data is enough but clearing all data may be needed.

If your phone isn't a android type, it may have a similar method but no idea on where it would be. Only ever used android phones. Still miss my old Motorola Razr. RIP. 🙁