iso alcohol, salt, plug both ends. shake till your hearts content. pour down toilet rinse thoroughly.
wither that or scrape with a straw as much as possible because its tasty as fuuuck! We mainly use bags tho so the whip has never really been dirty hah
you can also put it in a ziplock bag, add iso, salt, and shake the bag until its clean. Then rinse it out with water
Just cleaned mine the other day def just go for some iso and salt and you'll be done in a few good shakes.