Ok so you put a effect , like toy camera, on your photo and love what it does to you background. But not what it does to the main part of the photo...can you erase just a part of that effect on the photo so its not on the whole thing? I havnt been able to figure that out.
You can brush adjustments in and out, this works fine for individual adjustments but in the case of an effect that is applying multiple adjustments I don;t think there is a way to have one brush that affects all the adjustments applied.
You'd have to brush away each individual adjustment.