Usage patterns
〈場所〉を綺麗にするto clean up/tidy a place
I clean my room every Saturday.
綺麗に食べるto eat up completely, leaving nothing behind
The child ate even the vegetables completely, leaving nothing.
綺麗になるto become pretty/beautiful, or to become clean
She grew up and became beautiful.
綺麗に洗うto wash something thoroughly clean
Please wash your hands thoroughly.
Expressions
綺麗かったwas pretty; was beautiful; was clean