Flutter: remove all saved shared preferences

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