Do this at your own risk. Cleaning the Dust trapped under the Screen is on step 16. Check out step 6 for getting it free. Here's the Compaq iPAQ H3600 Hardware Design Specification for those of you interested in the technical side of what you will be seeing in the photos below. Click here if you are interested in upgrading the RAM of the iPAQ above the standard 32Mb.
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Backup the iPAQ data. Step 2 will cause a hard reset. Power down and switch off the iPAQ using the bottom switch under the sliding cover near the AC power jack. Remove the 4 screws using a Torx size 6 screw driver. Sears Hardware has the Torx screw driver part number 45729 for only a couple bucks.