Many pet owners find that a natural homemade recipe made of liquid dish soap, vinegar, and warm water is enough to kill fleas, but it isn't always effective enough. (wisebread.com)
You may be able to remove the black stains using liquid dish soap and water and a scrub brush. (articles.chicagotribune.com)
Another common problem to avoid is placing liquid dish soap in the dishwasher when you run out of dishwasher detergent. (rismedia.com)