greasy
My hair is so greasy! I really need to wash it. You know it's funny how we say hair is greasy, but skin is oily. English is very strange indeed!
grease monkey
Gross! Why do you let your hair get so dirty? Just because your job is a grease monkey, doesn't mean you have to be grimy like the cars you fix!
Noun
hard physical work, especially vigorous polishing or cleaning
elbow grease
Very funny! Now, how about you make yourself useful and help me with this car! You need to give it some elbow grease to get it looking beautiful.
grease the wheels
You are right! Now, if you keep your mouth shut, I'll give you an extra helper to grease the wheels and make sure her car is done perfectly by noon. OK?