How do I get rid of finger prints off my render ?

I have started to model this house.

Here is what I have done so far.

But as you can see the top of the house has finger prints around the top outside as well.

Is there a way to fix this with out re doing the top extrusion above the windows again or is it a case of back to the drawing board.

Any help would be appreciated. :o

Its forums like this that prevents me from giving up.:yes:

You have multiple faces occupying the same space.
Remove any double vertices
Remove any duplicate objects

Thanks allot Richard Marklew

and by the way the picture and floor plan came from this site:-

thanks again.