Do you like it?
You will probably have to delete floor more than once because you have multiple layers of flooring which is why it looks blotchy
So can I just delete a wall, then delete the floor and redraw the wall? I'll try that. Thanks
You've probably deleted a wall and added a wall back. Whenever you do this it adds another layer of flooring which gives this blotchy effect in the flooring. You need to delete a wall and then make sure you have all layers of flooring deleted before finally adding the wall back in. At that point you will only have one layer and the blotchiness will be gone.