Both options are recommended, though washing them is preferable. Whenever you have access to running water and soap, it is preferable to maintain good hand hygiene. Before and after any activity where you use them (cooking, going to the bathroom, eating, working, going outside...). However, it is possible that, due to the circumstances at a certain time, you don’t have access to soap and water. This is when we should use the alcoholic or disinfectant solution to keep our hands clean.