[Tracy Handl]

If the "mud" seems like red clay, an acid will do the best. Acids take up red clay the best. It has to have a surfactant with it and it won't need to be too strong. Products used for concrete cleaning that are as weak as will effectivly remove the mud, may get those are up well. Then wash with a normal wood cleaning product to even everything up if needed, neutralize, and then seal. My 2 cents. Hope it helped.