Can I wash it, and how?
Yes, gently: spot clean, or hand wash in cold water (up to 30 °C) with a mild detergent, then dry flat. Don’t rub or wring the yarn letters, don’t iron them and don’t use a tumble dryer. While the item is damp, shape the letters with your fingers so they stand up again.
Don’t soak woven straw bags: clean them with a damp cloth only. If the label sewn into your item says something different, follow the label. All the tips are on washing and care.