I've have a D70 and D70s, and have been able to blow off all the spots with
a blow brush. I take off the lens. Turn the body so the camera opening is
upside down  facing the floor and blow the spots off. Don't touch the sensor
with the brush unless a spot doesn't seem to fall away. A camera shop showed
me how to do this process.

I haven't had trouble recently with a dirty sensor. Taking photos in dusty
and rainy areas, I put the camera in a plastic bag.

A plastic bag also solves the problem of the lens will collecting moister
getting off and on an air conditioned bus or cab in summer, but that problem
is also solved by putting the camera in plastic bag before getting on a bus
or cab.

To see some of my sunsets got to:
http://www2.hagenhosting.com/~naborswe/sunsets/SunsetsThumbNailIndex.html

My WEB site also has several travel reports taken with other cameras indexed
at:

http://www2.hagenhosting.com/~naborswe/naborsindex/index.html

The latest travel report is "Libya, but there are also a few older travel
reports also indexed."

Bob

I've found it hard to get a perfect result with dry solutions (eg blow /
brush) so I went with a solution that involved Q-tips / cotton buds (Medical
/ sterile with long stem and tightly wound tips) & some form of water-based
"magic liquid".

About 1/2 way through the procedure I was getting pretty nervous -as I still
had globules of solution all over the sensor, but as I got to Q-Tip number 3
or 4 I was able to finally clean up all the fluid, give it a slight "dry
polish" and  - the result - PERFECT.

In your case I'd be inclined to repeat the procedure and see if you see any
change.

From what others have said in the past it's a procedure that freaks most
people out initially, but in reality is pretty safe so long as people are
careful. At the end of the day, you're not actually cleaning the sensor -
just the tough glass filter in front of the sensor.

It'll take a lot of practice to get it perfectly clean, if you can even
get it completely clean. Personally I don't worry about a few small
spots that only show up at small apertures. If they get in the way and I
feel they need to be removed, I fire up Photoshop.

So far I've only used a blower and a nylon brush to clean my sensor, and
I've had my camera over a year. One day when I get a really nasty spot
that blocks out too much detail, I'll buy some cleaning fluid and pads.

To me, cleaning the sensor is like cleaning the front element of lenses.
Some people waste time and effort "polishing" their lenses to a
sparkling clean shine. But in most cases the tiny amount of dust is
invisible to the camera and has no effect on the final image.

I'm just not that concerned about it since it has little effect on my
images.

This is the only way to do it:
http://www.pbase.com/copperhill/image/15473243

You'll need the tool (a modified spatula), some pecpads, and some special
fluid.  As someone else said, first try blowing the dust off, but if that
doesn't work this is the only method that will get you a 100% clean sensor.
Now, the other side of the coin is that you probably won't get to 100%
without some practice, and a few spots won't kill you and can easily be
removed with software.

The bottom line is that if you change lenses, which is the fun of having a
SLR, you will wind up with some dust now and then.  That's normal, so I
wouldn't lose sleep over it.

It's a matter of wrapping the pad correctly, using only about 3 drops of
fluid and then get in there before it evaporates.  Move across the top,
raise the tool straight up against the side of the sensor, move it straight
down, and then sweep across the bottom and lift the tool out of the sensor.
The amount of pressure you use is about the same you would use when writing.
Don't use the same pad twice, as dust it catches may get dragged across the
sensor and scratch it.  This is why you tilt it slightly on both passes,
tilting it one way then back the other.  Keeps what you trap in the PecPad
off the sensor.

I have a D70 also, and the first time I did this was a Doozy.  Had no idea
the sensor was so far in there, and the photos they show usually have the
sensor out of the camera.  Make sure you use the AC supply or a fully
charged battery, too.  Don't want that shutter and mirror closing on you
while you're working.

Also, some people put the camera on a tripod.  Some work in their lap, and
I've got to the point where I hold the camera with one hand and swab with
the other.  Again, don't feel bad if you don't get it all.  Won't show in
most photos, and when you see a UFO flying through the air on a landscape
it's time to clean again.