straighten vs clean up

straighten and clean up both are verbs.

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

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

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

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