Grease stains on a portion of vinyl siding

[Allen]

Late last summer, we developed what looks like light grease stains on a portion of our vinyl siding in the rear of house. I have tried numerous treatments to no avail.

A home center salesperson who used to power wash houses told me he thought it was a rare mold and to use something called Tuff Stuff, but I cannot find this product anywhere.

[home improvement guy]

Tuff Stuff is available at Walmart and AutoZone, to name just two places, and online.

I am not sure what those stains on your vinyl siding are, since what I typically see marring the surface are green mildew stains on the northern-facing sides of houses.

One website suggests the following for grease stains: Fantastik, Murphy's Oil Soap, Windex, or Lysol. Bob Vila's website concurs, so if you haven't tried any of these products, give one a shot.