She always gives the impression of being clean and fresh.
Literal
She [topic-は] always clean feeling [subject-が] does.
清潔な感じがする means 'gives a clean/tidy impression' — 清潔 (せいけつ) means 'clean, hygienic,' 感じ means 'feeling/impression,' and がする means 'is sensed/felt.' The pattern ~感じがする is useful for describing impressions or vibes someone gives off.