In order to start making money, thanks to Handwashing, you need to purchase soap. To do this, click on the "Shop" button. Next, buy soap that matches your budget (the price of the goods is indicated below). After you have bought the goods, go to "Storage" in order to select the soap you bought earlier. After clicking close "Storage" and click on the "Start" button (it is at the top). You will see an animation, after which you will be given virtual money, which you can spend on the purchase of other goods.