In retouching you see this quite frequently, whether you're using seamless paper, vinyl, a fabric hanging or a purpose built infinity cove, it's going to get dirty.
One option which we'll cover here, is to solve it in post, in this case using Adobe Photoshop.
We can't have someone or even ourselves their with a steam cleaner, getting out all the marks on our background fabric. Leave that to the post room editing, which this tutorial will guarantee a no more clean up rule.