Douse the stained vinyl siding with a biodegradable all-purpose cleaner. Fully saturate the food coloring with the cleaner.
Wipe the siding with paper towels, removing as much food coloring as possible. Always apply a fresh portion of paper toweling to the siding.
Moisten a rag with water. Wipe any remaining cleaner off the vinyl siding before the solution dries.
Inspect the siding for remaining food coloring. If any food dye remains on the siding, repeat the previous procedure and continue until all food coloring is removed.
Dry the moist siding with a towel once all food coloring is gone.