Brilliant patches after cleaning the display - what now ?

OK, I probably did something stupid.

Yesterday, I found my PB 1.33 (17) to be so dirty that I decided to go for a thorough cleaning with a "computer special" foam spray.

Juste because it worked perfectly for the casing, the trackpad and the keyboard, I decided to add the screen to my cleaning rage.

Indeed, it now looks beautiful ... as long as I don't turn it on !

When turned on, I get "brilliant" patches on some places.
Mostly, at the bottom of the screen, but the biggest one is on the right side, shaped like a triangle of 3,5 cms at the base and 5 cms high.

If I have to describe it, I would say : it does not look like dead pixels, because it is not a "white" or a "blurred" zone, but really a zone where luminosity of the screen dramatically improves !
Using Apple's Digital Color Meter, I have no discrepancy of color at these places.
Only light seems to be brighter... and, devilishly, the images look much better at these places !

My guess is that some cleaning foam must have inserted itself between the backlight and the screen, and by some physical "refraction" process, causes this "focusing" of light... or, second thought, that there was some dirt on the backlight that has been cleaned by the foam (only) at these places.

Now, of course, the questions : how will I fix this ?

Is there an easy way to open the lid of the PB to access the backlight and wipe the extra foam ? Or completely clean the backlight ?

Or might the cause be somewhere else ?

Or will I have to live with this, and wait until it dries ?

Any advice, experience or tips to access the screen are more than welcome.

Thanks in advance

Claude

PB G4 1.33 GHz, 17 inch, 1 GB RAM Mac OS X (10.4.8) LinkSys Router, 802.11g