Buy or otherwise obtain a bag of sharp sand, as its grittier constituency is more conducive to absorbing the water present in mud.
Cut off a corner of the bag so as to form a pouring spout.
Pour the sand directly onto the mud from the bag, covering the mud completely. Allow the sand to soak up the water in the mud, thereby creating a semi-dried mud-sand mixture. Sharp sand absorbs about 20 percent of its weight in water.
Scoop up the semi-dried mud-sand mixture with a spade and place it in a suitable carrying container, such as a bucket.
Dispose of the material ethically, taking care to observe local rubbish disposal regulations.