How do I get mud foot prints off my carpet

If you want to know how to get mud out of the carpet because someone was outside and stepped in the mud and then walked on the carpet with out taking off their shoes. The best think you can do is wait until the it dries and then you will be able to vacuum it all up. If you take a towel to it and try to wipe it up you will grind the dirt into the fibers and then you will have to wash the carpet. Dirt is not water soluble so it is always best to let it dry and then just vacuum it up.  Put dirt into a glass of water, it will fall to the bottom of the glass, if you stir the dirt and the water in time it will settle to the bottom of the glass

Using a vacuum is great for getting dry soil out of the carpet

Here is more about carpet cleaning