Mucus Milk is a reusable, cracked bottle of overflowing curdled milk. He is leaking milk from his cap, with some of it spilling out of his open, jagged mouth as well.
- Mucus Milk is similar to Flava Ava, a Season 1 Shopkin.
- He also shares a similar concept with Sour Milk, a Grossery from Series 1.
- He is one of two milk-based Grosseries from Series 2, the other being Maggot Milk.
- Unlike Maggot Milk, Mucus Milk is a bottle of milk, while Maggot Milk is a carton of milk.
- His static art portrays him as bulging, while his figure and catalog art give him a standard bottle shape.
- Despite his artwork, he does not come in a white variant.
| Series 1|
Yuck Yogurt / Stinky Cheese / Sour Milk / Rotten Egg
Cruddy Cream / Mucus Milk / Gutter Butter / Snot Whipped Cream / Pongy Parmesan / Maggot Milk / Blue Spew Cheese