About a month ago I posted a question about the cloning tool not being able to clone dark tones over light tones, specifically a light to medium brown background over a white truck. (Look at the upper left corner of the attached photo.) Antero replied with advice which I used with better results but it only partially covered the object. The clone tool works very well most of the time, except for dark over light.
This is a throw-away photo that I'm keeping just to figure out this one question. I'm open to suggestions including here.
OK -- not sure what you are doing -- I saved your posted jpeg and did a clone to get rid of the truck in LR4 and in CS6.
The LR4 clone job is not great, you don't get much ability to touch up unless you make copies and re-edit the copy -- so I just did a single clone and you can see where I cloned from and its not great -- although someone who did not know might miss it.
I then dumped a copy of the original into CS6 -- that was simpler. I used all default settings and started with a brush size almost big enough to cover the truck (but not as big as I had to be using just LR). I almost always use a soft brush in cloning, and did here. I then cloned from the road to the right of the other auto.
I then touched it up a bit by cloning from just above and to the right of the truck to make the background look a bit better.
Marion, I believe the earlier discussion related to the question why cloning doesn't work. One of the reasons was that the user tried to clone light over dark and the cloning brush was in Darken mode (or vice versa). If you use the cloning brush in Normal mode, it copies from source to target regardless of which is darker or lighter.
Dennis advices using a soft-edged cloning brush. I almost always get better results by cloning on a separate layer with 100% flow and a hard edge. That way I get pixels that are as sharp as the originals and not a mixture of the source and target. In a separate step I often add a layer mask, usually by starting with a selection of the cloned area. I can then paint black or white on the layer mask of the clone layer, thus hiding or revealing the clone. With the layer mask and black, white or gray paint I can move the border between cloned and original areas to natural lines that exist in the photo. That way the cloning borders are as unobtrusive as possible.
Certainly use a separate layer for the clone -- makes it easier to later adjust things.
Soft vs Hard brush -- depends ...
I use soft for my first pass, then if needed I zoom WAY in and go hard to fine-tune -- but I find that the find-tuning is not always needed, and I find soft does a nice job of merging data from some other spot on the photo.
What you REALLY need to do, is play around lots (and lots and lots ...) and see what works best for you!
You may want to consider upgrading to the latest version of elements. There have been a lot of improvements since 8. One of the biggest being content aware fill. I am not saying that there is anything wrong with 8 just that life is easier with 11.