straighten out vs clean up

straighten out and clean up both are verbs.

Word	Noun	Adjective	Verb	Adverb
straighten out	No	No	Yes	No
clean up	No	No	Yes	No

As verbs, straighten out and clean up are synonyms defined as:

Other synonyms of straighten out include neaten, square away, straighten, tidy, tidy up.

straighten out (verb)	clean up (verb)
put (things or places) in order	make oneself clean, presentable or neat
settle or put right	put (things or places) in order
change for the better	finish attending to
make free from confusion or ambiguity; make clear	make a big profit; often in a short period of time
make straight
extricate from entanglement