"Smudges" on the screen, can't get rid of them.

I've been mostly satisfied with Macbook Pro 15" but about a month ago I noticed this "smudge" on the screen. I didn't make much of it, and when I got home I cleaned it, following Apple's instructions. With the MBP turned off, it seemed my screen was spotless. Surprise, surprise, I open it the next day at work and find the smudge still there, unchanged. Weird. I tried cleaning it again, perhaps I hadn't done as good a job as I thought, but after the second (and third, and fourth) attempt to clean the screen, still, the smudge remained. And now there's two of them! I have no idea what caused them, I'm quite careful with my MBP and nobody else uses it besides me.
A detail that might or might not have anything to do with the unknown origin of these smudges: they're mostly on the same horizontal line and at almost the same distance from the screen margins. With the lid closed, the right smudge corresponds to the ; (above the right apple key, Portuguese keyboard) and the left one over the X.
The following link is a photo of the right side smudge. It is most visible when over a bright white background.
By itself this is VERY annoying, every 10 seconds my eyes are diverted from the work I'm doing and noticing those ugly things. Adding to that, I'm a designer, working heavily with illustration, print, web and video, so you can have an idea of what crystal clear images mean to me.
I've been doing some research but haven't found anyone with the same problem. Seen some images of screen problems, but they didn't seem to be the same thing. Has anyone had a similar problem? Thanks in advance.
Macbook Pro 15"   Mac OS X (10.4.9)   Bought November 06, 2Gb RAM

Water is one of the worst things to use, especially if you live in a hard water area, as I do. The CaCO₃ in hard water is slightly abrasive and will scratch the delicate coating on the screen.
Apple's own recommendation (emphasis mine):
"How To Clean an LCD Panel
This article describes the best way to clean an LCD panel such as those used on PowerBook computers and Apple flat panel displays.
To clean the LCD:
1. Turn off the computer or display. You may need to turn off the computer in order to turn off some Apple displays.
2. Dampen a clean, soft, lint-free cloth or paper with water only.
3. Wipe the screen. Do not spray liquid directly on the screen.
You may also use a mild glass cleaner that contains no alcohol or ammonia. Most office supply stores sell cleaning kits specifically designed for this purpose."
I doubt very seriously that any water delivered to anyone's house would be so abrasive, especially in the small amount one would use to clean an LCD screen, would be sufficiently abrasive as to damage a screen. The cloth or other wipe used is going to be far more abrasive that any water that's drinkable by humans. I think Apple (and every other LCD vendor I checked) would not recommend the use of water if it could be a problem. Problems with hard water come more from scaling, not abrasion, and scaling is unlikely to be a problem just from a damp cloth.

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