Immediately prior to departure, make sure your wings are still clean, i.e.,

• your aircraft has not been exposed to freezing precipitation,
• active frost conditions are not present, or you applied de/anti-icing fluid and it has not failed,
• you did not taxi through deep slush or puddles,
• and you were not splashed by another aircraft.

If you are unsure, taxi back or conduct an external check. ATC may allow you to conduct this check without taxiing back.

If you are good to go, and the runway conditions support a safe departure, then complete your normal takeoff procedures and depart.