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Okay, first, we will need some kind of image editing program like GIMP or Photoshop. I use GIMP personally, because it's free, so I'll write on how to touch up Dusty's and cases's scans using GIMP.

Let's start with the scan you pointed out, PAGE 68:
http://img190.imageshack.us/img190/9676/page68.jpg

Click on the numbers in parenthesis you see in this post from here on out. They're pictures to show you stuff.
Straightening out the scan
Open it with GIMP and zoom in at 100%. At this point we'll want to straighten out the scan, so we will use a small line of text as a reference to turn the image. Use "BOSSES" for this one. Pick a tool like the Free Select (Lasso) Tool I've selected http://i9.photobucket.com/albums/a67/MontagueHawke/How%20To%20Clean%20Scans/Picture1.jpg, click on one end under BOSSES, hold Control and click on the other end to make a horizontal line http://i9.photobucket.com/albums/a67/MontagueHawke/How%20To%20Clean%20Scans/Picture2.jpg. You can see how badly the the image is tilted, so now we will use GIMP's Free Transform http://i9.photobucket.com/albums/a67/MontagueHawke/How%20To%20Clean%20Scans/Picture3.jpg to straighten it up. For this scan, use the values I choose http://i9.photobucket.com/albums/a67/MontagueHawke/How%20To%20Clean%20Scans/Picture4.jpg, or something similar to it, and hit Rotate. If you want to check to see if the image is straight, do the lasso thing again http://i9.photobucket.com/albums/a67/MontagueHawke/How%20To%20Clean%20Scans/Picture5.jpg.


Cropping the scan
Now that we're done getting it straight, we will crop the image so that cases's scanner or some other thing won't be visible. Use the Rectangle Select Tool http://i9.photobucket.com/albums/a67/MontagueHawke/How%20To%20Clean%20Scans/Picture6.jpg, and try to select as much of the scan as you can, but omit the parts that have been cut off. I know, it sucks, but we'll have to make do with what we have. Select to the best of your abilities. When you're done, hit Crop to Selection http://i9.photobucket.com/albums/a67/MontagueHawke/How%20To%20Clean%20Scans/Picture7.jpg under Image and it's done.


Touching up the scan
What's wrong with most scanners is that they either scan them too light or too dark and create some ugly scan lines/grain when scanning them in high DPI. Here, we will do some minor color correction and purge as much scan lines/grain as possible.

Let's zoom in to our girl here http://i9.photobucket.com/albums/a67/MontagueHawke/How%20To%20Clean%20Scans/Picture9.jpg. Then go to Filter > Blur > Selective Gaussian Blur http://i9.photobucket.com/albums/a67/MontagueHawke/How%20To%20Clean%20Scans/Picture8.jpg and use the values I chose http://i9.photobucket.com/albums/a67/MontagueHawke/How%20To%20Clean%20Scans/Picture10.jpg. Hit Selective Gaussian Blur again, but use different values this time http://i9.photobucket.com/albums/a67/MontagueHawke/How%20To%20Clean%20Scans/Picture12.jpg. This is to smooth out some more of the grain that the first one didn't take care of. It should look much better now, but the Blur apparently made the image a bit flat as well. So now we will use the Unsharp Mask filter http://i9.photobucket.com/albums/a67/MontagueHawke/How%20To%20Clean%20Scans/Picture13.jpg to help get the image some shine again. Once again, use the values I chose http://i9.photobucket.com/albums/a67/MontagueHawke/How%20To%20Clean%20Scans/Picture14.jpg or something similar to it.

Now that we're done with that, we're ready to do some minor color correction. Find Curves under the Colors tab, and you'll get some graph with a line. Changing these lines will affect the image greatly, and we only want to get its color back, so go along with my line http://i9.photobucket.com/albums/a67/MontagueHawke/How%20To%20Clean%20Scans/Picture17.jpg.

Now, find Brightness-Contrast under Colors, and change the Contrast to 5-10 to give it some color http://i9.photobucket.com/albums/a67/MontagueHawke/How%20To%20Clean%20Scans/Picture19.jpg. And we're done!

Not really.


Using the Clone tool to get rid of white specks

Oh, those little ugly white specks can just ruin an image. Take a look at an area in the top right corner around BOSSES and you can see three little white spots http://i9.photobucket.com/albums/a67/MontagueHawke/How%20To%20Clean%20Scans/Picture20.jpg. Here, we will use the Clone tool to sample a spot and an area and use that to fill in the white spots, making it look like as if it never existed. Pick the Clone tool (if you don't know where it is, hover your mouse over the tools and it'll tell you the name of the tools. The Clone tool looks like a joystick pad or a stamp) and Control click and area next to the white spot. Use the keys [ or ] to decrease or increase the area of your Clone sample. Then stamp over the white spot with about one or two clicks, and there should be no more white spot there. Then go ALL over the image and take out obvious white spots as much as you can.

NOW you're finally done.