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✅ EASY TO USE: RAIN PREP couldn’t be easier to use. Simply dilute 7 parts of water to 1 part of RAIN PREP, apply it to the exterior glass surface, and wipe dry. For a deeper clean, use a clay bar or Autoscrub with RAIN PREP and gently scrub the glass to remove dirt and other contaminants, restoring the brilliance of the glass to a crystal clear finish.