If left unaddressed, discoloration and damage to the siding could leave your home looking run down and ugly, or it might even lead to the deterioration of your siding. For instance, wood siding left unprotected can dry out, warp, crack, and even rot. It could allow insects to colonise the siding, or, worse, even penetrate into the home. Vinyl siding left unprotected for long periods may even dry and crack, suffering from dry rot.