This tip didn't work for me. Unfortunately many people online, especially influencers, try to present the idea of shampooing less (or not at all) as a panacea for many scalp conditions (including oiliness and even hair loss). If you're curious enough you can try it for a couple of weeks or a month and then assess. If not, try sticking to daily washes, alternating between a gentle shampoo without sulfate, and medicated shampoos (the ones I mentionned above).