I've an old 3'by 4' map of North America copywrite 1908 with raised
mountains and built in frame. It's quite dirty and would like to
cleanup for display. What should I use to clean it??????  Thankyou,
ffastlane

Give it to your local arts or history museum and they will give you a
nice and bright copy of your refurbished document.

Ffastlane,
As I recall, that kind of map is well printed, providing a rather
impervious surface, so most dirt should only be on the surface and
careful application of water should not damage it.
First, I would vacuum it using the upholstery brush.  If there are any
cracks full of dirt, use a toothbrush gently to dislodge it.

Then with a fairly mild soapy solution of warm water, with a sponge
and paper towels to dry, I would test removing the dirt on an
inconspicuous place.  If the printing extends around the "frame", a
good place would be the upper side of the top frame, since when
displayed this will be above eye-level.  It will also probably be the
dirtiest surface, and being 4 feet long it will allow you space to
gain experience.  Obviously, you don't want to do more than moisten
the surface and dry it immediately.  Check the sponge to see if ink
has been rubbed off, and, of course, change the water.
If this is successful, then I would start on a small flat area of one
color, so that if it does fade, it won't be so noticeable, a Great
Lake for example.
Hopefully it won't, 'cause if it does, you can stop reading here.  ;)

Then continue, saving the mountains till last, when you have more experience.
Maybe a soft handbrush is better than a sponge for cleaning them.

Don't try to work too fast or for too long periods.  If you stop
concentrating on what you are doing, that's when things go awry, like
tipping over the water or trying to clean a too large area at once. 
Keep out of the Ffastlane.
I would recommend cleaning an area of one color in one session if
possible, so that your work on that area will be of even quality.

You may want to restore scratches or wear on the frame.  I would be
cautious about attempting this; honest signs of wear are less
obtrusive than an obvious repair.  But maybe watercolors would be a
possibility.  Again, you can test on the frame to see how it takes and
dries.

Good luck!  Maybe I should refer you to the disclaimer below.  I am
not an expert  - I just love to tell other people what to do. :)

Myoarin