擦不掉的髒
這一支就是核心畫面本身：看得到、摸得到、要用力刷的髒。
noun · B2
Dirt that has built up and stuck to a surface, especially the unpleasant kind that is hard to clean off; also the general state of being dirty like this. Informal, and heard more in American English.
頑垢／髒污
核心畫面
One way to hold grunge: the dark layer that has sat on something too long and will not wipe off — the ring in the bath, the film on an old . Everything else the word does keeps that not-cleaned-up feeling.
「grunge」的核心畫面可以想成那一層擦不掉的髒。浴缸底那圈黑黑的東西，或是爐台上結住的油。不是剛落下的灰塵，而是…更多收起
「grunge」的核心畫面可以想成那一層擦不掉的髒。浴缸底那圈黑黑的東西，或是爐台上結住的油。不是剛落下的灰塵，而是放太久、黏住了的那種。這個字走到哪裡，都還帶著「沒有整理乾淨」的味道。From the word’s history
Wiktionary records grunge as a back-formation from grungy, so the adjective for dirty came first and the noun was cut out of it.
來源資料說 grunge 是從形容詞 grungy（髒兮兮的）倒推出來的名詞。也就是先有「髒的」這個形容詞，之後才把名詞切出來。這條線索正好對上它核心的髒感。
Wiktionary entry for grunge (kaikki:3f6f69a190036ae4:965088525): "Back-formation from grungy."
Two branches
把那種髒穿上身、彈出來
一種想法是：這一支把核心的髒感從浴缸搬到了舞台和衣櫃。原本是沒人想要的狀態，這裡變成刻意選擇的樣子。這是概念上的連結，不是在說歷史上誰先誰後。
noun · B2
A style of rock music and of clothing that became popular in the early 1990s, starting in Seattle. The music is loud and heavy, mixing punk and metal, and the clothes are deliberately scruffy — torn jeans, old flannel shirts, messy hair.
油漬搖滾／邋遢風