We have a concrete patio slab under a huge old oak tree. With all the shade, when it rains, the patio dries slowing, and the white concrete is now a dingy dark color from the yuck on it.
I can power wash it - but it comes back next year.
Wondering what I can use as a sealant to help prevent the dark dingy micro growth ? Most of the online blogs don't like the big box concrete & deck sealers.
I don't want the patio to become slick when wet because it has been painted with a sealer... Suggestions ????