What would i use to clean engine oil from parts of my engine after an oil leak ?

Something that will clean up the oil easily ?What would i use to clean engine oil from parts of my engine after an oil leak ?
use simple green..its biodegradeable too! soake it with simple green and hose it off...What would i use to clean engine oil from parts of my engine after an oil leak ?
Engine degreaser from the auto parts store.
Go to the auto parts store and get a can of GUNK
Jobbers carry a product called engine cleaner/degreaser , Was that really that hard? You can fix an oil leak but can`t fiqure out how to degrease a motor?