Here is the very short answer, but has been effective over the past decade and a half.
Start with Warm Soapy Water (Should probably get the majority depending on the density of the spill) and if that ... read more
We like the finished results very much and are glad that we chose Opal. We've received countless compliments from neighbors about the finished project. Opal did an all around excellent job from helping us to select siding and later also soffits and gutters, to follow up on how we liked their work.... more