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There's probably several different ways to skin this cat (there always are in Photoshop), and it's be easier to give specific input if there was a picture to look at, but in general I'd probably tackle the problem with something like this: Create a Hue/Saturation Adjustment layer Modify the layer mask such that only the area with bleed problems is selected ...

The green is there and is being reflected by the car. Eliminating it requires post-production which is exactly how its done with for visual effects in movies. You use a tool called 'Color-Curves' (or similar name depending on the S/W) and basically reduce the amount of green in green areas until it looks natural. A change in WB is not what you are looking ...

I'm no expert on this, but my basic understanding is that you generally want two lights, on either side of the background (not at 90 degrees to it), aimed towards the center, far enough back to illuminate evenly, and angled downwards to reduce spill. Continuous lighting is probably better for this, or at least makes it easier to ensure that you're correctly ...

Why don't you take one shot with the green screen and another (from exactly the same position) with a white screen covering the green screen? The green screen will identify pixels to be replaced by scenery in the white screen picture. The white screen doesn't have to be perfectly white or even uniform; its role is to supply the desired lighting for the car ...

In addition to Itai's post production setting, two things come to mind for in the studio that are commonly used for video green screen: distance. 8 to 10 feet of it between the green screen and the object. MINIMUM. a linear polarizer, rotate it around to find the best angle to kill the bounce.

John Cavan's answer is definitely more thorough, but I'll answer from a tiny bit of experience. I took my kids recently to a Discovery Science museum here in Souther California, and they had a cheap green screen setup with a video camera aimed at it. The point was to let the kids try on different costumes and dance in front of the camera and see themselves ...

I have only done this twice - so I am no expert either. But both times I have done it, the lighting on the background itself did not really matter - since they will be replaced anyway. John Cavan's answer is excellent in getting equal lighting on your background - but what I am trying to say is that that effort in doing that might be unnecessary for green ...