Mother nature’s weather events can be devastating to wood. Rain, snow, and dew are quickly absorbed by unprotected wood, causing it to swell. The dampness attracts pollen and fungal spores, which collect and cause discoloration along with shrinkage from the suns heat drying the surface. These cycles of wet and dry, swelling and shrinking will cause the wood to warp, split, crack, and become unattractive and this is where deck power washing can help.