In reply to The Lemming:
I'd use the 'replace colour' tool.
The wand can be fiddley and take ages to get clean.
Use the polygon marquee selection thing, to quickly select the ceiling area.
Then choose Image>Adjustment>Replace colour.
It's very easy to change hue and brightness etc.
If you use the '+ eyedropper' you can click on different areas to keep adding ranges of colour until the black and white selection image shows you what you want.
Hope that makes sense