Removing the app data permenantly

I read some threads here but could not get any help. I basically want to remove all data related to an app that I uninstalled in Nougat. I used some apps, I went to data folder, deleted some files etc but when I reinstall that app, it shows all my data. Only if I factory reset or wipe cache and data then this does not happen. But I dont want to do that everytime. So any fellow experts here can guide me a perfect solution to this. Where is this app data stored so hidden that I cant trace it and delete it but when app is reinstalled, it traces the path and picks up old data? Thankyou for your help.

Welcome to the forums. Which app is that? Did you download it from the Play Store or from a different source? You could try this, next time before you hit the uninstall button first 'force stop' and clear data for the app. See if it works.

Some apps are written to clear their data as part of their uninstallation function, but it's still a good idea to do as Javier suggested - force stop, clear cache, clear data (in that order), then uninstall.

The app data isn't hidden, it's normally kept in a folder the app created. You can't access it unless you're the app (or running the app) or the phone is rooted. That's just standard Linux (which is the operating system Android runs on), not something the app developer did.