Shop Soiled items have a lot of love left to give but have a minor flaw or are a bit dirty.
Grade A Shop Soils are just dirty or don't have anything major wrong. Most soils can be washed out before dyeing or won't be noticeable once dyed.
Grade A Shop Soil flaws could include but are not limited to:
dirt, stain, any other imperfection that can be dyed over or washed out