Start at the bottom of the stain and work your way to the top.
How to remove stubborn stains from vinyl siding.
Peroxide hydrogen peroxide has also been said to work especially at higher strengths.
Spray with clean water.
For a stronger solution mix together one third cup powdered laundry.
Fill a bucket with hot water and either add the cleaner to it or have it ready to go.
If the area still appears stained spray it again and wait a few minutes before scrubbing.
Try several different cleaners to find which one works best on the particular stain for your siding.
Rinse the solution off of the vinyl starting from the top so the water will run downward.
Oxygen bleach may remove both oil and water based stain.
Pour whatever solution remains in the sprayer back in the bucket.
Mouthwash mouthwash is something many swear by for cleaning artillery fungus off of vinyl siding especially mint laced varieties.
Rinse the sprayer and refill it with clean water.
Apply it allow it to bubble and then brush it off with a wet scrub brush or sponge.
For tough spots like paint drips tar and pencil and pen marks use a nonabrasive bathtub cleaner or nylon scrub pad.
Moisten the area with water and then scrub it using the cleaning solution.
Dip the scrub brush into the bucket of bleach solution and scrub the stained areas gently.