Even through all of the training, SpongeBob continues making frozen milkshakes and eventually fails. However, after saving Frostymug from a blender, he learns from him how to properly make a milkshake.
SpongeBob then uses his own body to make a milkshake, by which Harold is highly pleased.
Milkshakes also appear on the title card for "License to Milkshake."
SpongeBob made a total of five milkshakes in "License to Milkshake." Three were frozen, one was a Krabby Patty, and one was a perfect one.
The KK milkshakes are called "Double Dip Milkshakes," as revealed in "License to Milkshake."
"Sun Bleached" is the only episode where SpongeBob drinks a milkshake from an ice cream parlor instead of the Krusty Krab.