Flutter: remove all saved shared preferences

You can simply use clear() function with your variable it will clear all the shared preferences.

SharedPreferences preferences = await SharedPreferences.getInstance();
await preferences.clear();

If you want to remove particular key value from shared preferences with key name you can do it like this way as follows.

SharedPreferences preferences = await SharedPreferences.getInstance();
await preferences.remove('KeyNameHere');

I use shared_preferences plugin:

In pubspec.yaml

dependencies:
  flutter:
    sdk: flutter

  shared_preferences: ^0.4.3

And in dart file:

import 'dart:async';
import 'package:shared_preferences/shared_preferences.dart';
...
SharedPreferences preferences = await SharedPreferences.getInstance();
await preferences.clear();

I think this is what you need