Sorry, but that really is not very acceptable. I bought what I thought was a fine instrument. And as such, I was not in any way expecting to become a part-time camera technician. And, that D-SLR's have even been in production for 15 years is complete news to me. Believe me, I love the camera. But as this is being heavily promoted by Nikon as a beginner's D-SLR, and is marketed to people migrating from traditional point and shoot's, asking them to perform maintenance on delicate, expensive instruments in order to get original "out of the box" performance out of the camera, seems to be asking a lot. My own retailer is hesitant to do any cleaning such as you described, and all of the guys at this store are photographers by way of background. Even they have great reluctance to perform such maintenance on this camera.
Do you have any more detailed instructions on how to do this, other than the somewhat vague and ambiguous instructions in the owner's manual?
This was a Nikon technician's (I will keep him nameless) "official" word on dust on the low pass filter/sensor, which I already have on my Nikon D40, after less than 2 weeks of ownership. My retailer, which will remain nameless, is exchanging it for a brand new one tomorrow. I love the camera, but, come on guys. And, have D-SLR's even been around for this long?
I've been using D-SLR cameras for almost 15 years and dust is always an issue. In most cases I never worry about cleaning dust from the cameras because usually the dust doesn't show up. If I am shooting a smooth toned subject (clear blue sky, gray background, etc.) I will clean the sensor with a bulb blower and it works fine. Keep the camera pointed down and use a few puffs from the blower. You can usually see the dust on the internal filter if you get the light just right so it may take a few puffs to clean it off, but it almost always works fine.
This is perfectly normal and after a few months will become routine. Even some of the newer cameras which purport to have "anti-dust" sensors and special devices require this cleaning and it shouldn't be feared. Thanks