Ask a grown-up or someone that know how a washing machine works/how to wash by hand to show you. Choose three garments to wash by hand. Look inside the garments for laundry symbols.
To learn different symbols you can make a memory game. Draw the chosen symbol on one card and on the other card that it will pair with you write the meaning of the symbol. Do so for as many symbols you want, and then play memory by finding the pair; symbol and text.
You can find some common laundry symbols on Wikipedia
