Scott Wade is a talented artist and like other curious as well as creative artists cannot resist himself from dirty car windows. Scott initially started a bit amateurishly but his recent works show much sophistication than before. He lives on Caliche a dirty road commonly referred to as road-base by locals and this area is an interesting combination of limestone mixed with gravel clay. Scott began experimenting on cars which when driven over this road becomes accumulated with dirt through his techniques for achieving such detailed and shaded drawings. Have a look at his beautiful and amazing work in this link.