The cedar siding on my home had not been tended to for over 35 years, since it was built. It is truly amazing that the formula that John has invented does such an amazing job of cleaning the dirt & mold that has collected over all that time,and it is ecologically safe, as I live near a pond. Nick & Doug who did my home were knowledgeable, efficient & respectful of my property. On top of all that they were timely, hard to believe on Cape Cod! Would not hesitate to recommend this business. Wish I had pictures to show.