clean up vs straighten

clean up and straighten both are verbs.

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

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

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

clean up (verb)	straighten (verb)
make oneself clean, presentable or neat	put (things or places) in order
put (things or places) in order	make straight or straighter
finish attending to	make straight
make a big profit; often in a short period of time	straighten by unrolling
	straighten up or out; make straight
	get up from a sitting or slouching position