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It can be useful in the great outdoors for the same reason that dish soap is useful in the kitchen: to remove grease from dishes. If you spend a significant amount of time working outside with your tools, you probably already know how important it is to keep them clean. Use dish soap to wash your tools instead of going through additional steps to make the process more complicated.
Dish soap is an excellent choice for removing grease from tools because of its mild nature. After you have finished working on your car engine or some other dirty project, all you need to do to clean up the mess is soak your tools in dish soap and they will be as good as new. Your tools will look as good as new after being cleaned with dish soap because it will eliminate grease, grime, dirt, oil, and pretty much anything else.