Used 2 or 3 times. I only put in unsweetened lemon water, so there's no need to worry about stickiness or color transfer. The head of Shiro has some blackening, but it was in this condition since I received it, and I haven't taken it outside at all. When shipping, I will soak and disinfect the straw with bleach before sending it. A tumbler with a straw designed with the character Crayon Shin-chan. - Brand: Crayon Shin-chan - Color: Cream - Design: With characters - Material: Plastic - Features: With straw, with handle Thank you for looking.