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Had a job today to remove egg from hardie siding.  I was planing to do all kinds of exotic things to remove it including a little grafiti remover...  Well my Female employee was with me on this job and said "Why not just use Dishwashing Liquid?"  I use it to clean dried egg off of my dishes.....  A long story short, some liquid gain a sponge and a scrub brush.  No more egg.  This pressure washing is sure simple isn't it.