Use the same mess-clearing materials and methods food manufacturers and egg producers do. At least, that's the advice of Pat Curtis, a professor at Auburn University and director of the National Egg Processing Center, an alliance of universities that studies and promotes egg quality and safety. "Removing egg," Curtis says, "is a problem that we deal with in the industry every day."
"If there's one thing I can't stress enough," she adds, "it's to use water that's warm, not hot. Eggs are protein-based, and using hot water will cook the egg onto the surface, causing it to adhere much more closely." Warm water right out of the faucet is more than warm enough to do the job, Curtis says.
And there are still other tricks of the egg-removal trade. "First, remove the egg as quickly as possible," advises Bob Reynolds, a chemist at Zep, Inc., a manufacturer of detergents and cleaners. Given its high moisture content, an egg is most vulnerable to cleaning while it's still wet. After its moisture evaporates, it becomes physically tougher and is converted into a simple protein glue.
So get out the hose and gently wash the egg off the house. To do that, first wet the siding below the egged area, making it less absorptive. Then, using gentle water pressure, spray the siding above the egg to form a sheet of water that will flush it off the siding. If you can get above it with a ladder, that's even better. Whatever you do, don't simply turn the nozzle on the egg and blast it, splattering the mess all over the siding and surrounding surfaces.
Next, attack its chemical structure. "The egg's fats and proteins, those are the key things that you have to go after with a good high-alkaline detergent," Reynolds says. These cleaners are best at removing organic materials (food, fat, blood, grass). They're not to be confused with acidic cleaners such as vinegar or citrus extracts, which are better at removing inorganic materials, such as clay and rust. Acidic cleaners will cause the egg to coagulate, making it more difficult to remove.
Read more: Egged Halloween Cleanup - Egg Removal - Popular Mechanics
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