Homemade Vinyl Siding Cleaner

Having a house that is completely covered in white vinyl is a challenge to keep clean. The part of the vinyl covered by the front porch does not get washed in the rain, so was looking pretty dingy.
I found this recipe years ago but can't remember where I got it to attribute it to the author.
Vinyl Siding Cleaner

• 2/3 cup of Spic and Span
• 1/2 cup powdered Tide laundry detergent
• 1 quart liquid chlorine bleach
• 3 quarts hot water

Mix ingredients in a 2 gallon bucket and allow to stand for 4 to 5 hours. Pour into ordinary garden sprayer and apply to vinyl siding. Leave solution on siding for 5 minutes and rinse with hose. When you spray it on, you will see the dirt, film and mildew slide right off.