Crane Diffuser and Top Fill Ultrasonic Air Humidifier

This humidifier was used for about 6 months and it still works great. I tried cleaning it as much as I could but there is still some residue (see pics). Additional info can be found on Amazon: https://www.amazon.com/gp/product/B07X279GWZ/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1