Cleaning a schmotz off the iBook screen... and HD and Optical drivequestion

FIRST: I was hoping to find this info in a FAQ somewhere, but couldn't come up with it. I have an iBook G4 (14-inch Late 2004)/1.33GHz/768 MB RAM/ATA 40GB HD/Slot-loading combo -- NOT Super -- drive) that I bought second-hand from some leased-computer salvage yard. The price was right and it works fine, but in its former apparently corporate life, it looks like somebody blew their nose on the screen, then made a half-hearted attempt to wipe it off with a dirty sock. There's a schmotz almost dead center in the screen (that you can really see when the Book is on) as a maybe 1 mm gray smudge, and when the Book is off, you can see a larger, streaked area where someone apparently tried to clean off the original blemish, whatever it is. Could someone suggest the safest, least screen-threatening method of cleaning this muck off the display?
SECOND: I have a couple Aluminum (I think, though the ports arranged at the rear -- not the sides -- make them look like TiBooks) 15" PBG4s. One has a 40GB, and the other has a 60GB 4200-rpm Ultra ATA/66 HD (though I thought the bigger one was 80GB or 100GB -- is this possible?). Both PBG4s are in full working order, except their displays are dead (one from me dropping one of the 'Books on a tile floor from a height of about 4 feet, the other from the dreaded display-cable-through-the-left-hinge-flex-and-finally-break syndrome. Since the HDs in the PBG4 are Ultra ATA/66/4200 rpm, and the iBook G4 HD is a 40GB ATA/100 4200 rpm, is it possible to swap one of the PBG4 Ultra ATA HDs for the plain old ATA HD in the iBook G4?
THIRD: Is it possible, or even worthwhile, to replace the iBook G4's Combo Drive for one of the PBG4 SuperDrives?
Thanks for your help!
Bart Brown

Bart:
The HDDs from the PBs should work fine if they are still functional. Any 2.5" ATA/IDE drive should work.
In terms of the smudge, try a damp lint-free cloth. You may need repeated applications. Wipe in circular motions. You can probably try a mild soap like ivory, but wipe it off with a damp cloth immediately. Soaps other than ivory may have caustic substances that can hurt the display.
In terms of swapping the optical drive for a SuperDrive it may work, although I am not sure if they both need to be the same make. Try it and let us know.
cornelius

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