According to kitchen utensil maker OXO, along with Starbucks, Apostle Coffee, Lavazza, and Stumptown Coffee Roasters, we should ideally being adding a step commonly used on teapots, known as “scalding”.
Article source: https://www.huffingtonpost.co.uk/entry/preheat-french-press_uk_6aaa90cae4b0288deb0e0d71