My husband took a power washer to our 9 month old patio - Cambridge Onyx smooth XL pavers to be exact. his intentions were good as he was simply trying to remove some stubborn stains here and there from the winter so he didnt do the entire patio, just in certain spots. however upon drying we could see basically a map of where he used the power washer. it looks like someone used charcoal spray paint to graffiti on the pavers wherever he used it. Lines and dark spots everywhere! is there any way to salvage this? we are devastated!