dirty grease

uncountable

Grease which contains remnants of other materials (e.g. particles of food, metals, chemicals, dirt, etc.).

Japanese Meaning

異物（食品残渣、金属、化学物質、土など）を含む油脂 / 不純な、汚れた油脂

The mechanic had to scrape away the dirty grease from the engine bearings before inspection.

整備士は点検の前に、エンジンのベアリングから異物（食品片や金属片、化学物質や汚れなど）を含んだグリースを削り取らなければならなかった。

Sense（1）

Grease which contains remnants of other materials (e.g. particles of food, metals, chemicals, dirt, etc.).