ADVERTISEMENT
Use an old, used toothbrush: not only is it easy to handle, but it can also reach places that would otherwise be difficult to reach. Spread a little toothpaste, rub it over the entire surface, insisting if necessary. You should make circular movements exactly like you do when brushing your teeth. Leave on for around twenty minutes, then dry with a soft, slightly damp cloth to remove the excess.
Easy, isn’t it?