Learn English – What do we call a person who is obsessed with cleanliness

A callithumpian

1836, U.S. colloquial, probably a fanciful construction at one time designating a society of social reformers, then in reference to "noisy disturbers of elections and meetings," and most commonly "a band of discordant instruments."

Actually paired adjectivally with chaos in stanza 84 of David Van Alstyne's 296-versed mouthful of a poem:

buccaneerishly galumphing into grievous garboils of chthonian uproar and terpsicoresan bedlam, and for gallivanting in great gyres of callithumpian chaos in a three-ring circus of near-simian agitation

If you're looking for a neutral word which doesn't carry value judgements, try "frugal".

If you want a word with fairly positive connotations, try "economical" or thrifty (noun: saver; note: spendthrift is a noun, but it has the opposite meaning to thrifty).

If you want a word with negative connotations, try "cheap" (nouns: skinflint, miser, cheapo).

There are plenty of other synonyms to choose from in the thesaurus, if you start with one of these words.