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the lens does not come off of that camcorder easily. if the dust is on the outside just use a little windex (spray the cloth, not the lense) and wife in a circular motion. If the dust spot (maybe its not dust). is on the inside you will have to have the lens taken off by a professional.
It's likely that the spot is a speck of dust that has found its way inside the camera and onto the sensor. Apparently when the lens barrel extends after the camera is turned on a small amount of suction is generated - enough to pull tiny specks of debris inside. Please refer to the following video: https://www.youtube.com/watch?v=0nmwt0frZns
The spots can be in the inside of the lens settings to the CCD/imager.
If the cleaning of the lens is done well it can be a speck of dust logged in to the screen and having it on the image.
A careful cleaning in a dust proof set up is required.
Your lens would need to be absolutely filthy with enormous dirt specks to cause the fault you describe. Dust, fingerprints, and regular minor debris simply doesn't show in the final image. In any case, you cannot clean inside the lens without dismantling it and that is a job for experienced specialists only.
Your fault is a dirty image sensor. You can buy sensor cleaning kits, but if you're inexperienced with them or trying to clean the sensor in a dusty environment you'll just make matters worse. Many camera shops offer sensor cleaning while you wait at relatively low cost. The reason you don't see the dirt when taking the picture is either because you're looking through the optical viewfinder or because the LCD screen simply doesn't magnify the image enough to show the marks which are present in the image.
You can prevent the dirt from reoccurring by never leaving the camera with the lens throat open for more than strictly necessary, and by always trying to keep the open lens throat pointing slightly down when swapping lenses.
I hope that I've helped, please take a moment to rate my answer.
I think the problem is with the technician. I suggest you talk to the manager and ask for another technician to help you with this problem. I do not recommend trying to clean the sensor yourself as you may cause more harm than good.
It is probably a speck of dust on the sensor. Get a blower from any camera shop, remove the lens,lock up the mirror (mirror lock up in camera menu) and give the sensor a good blow ( without touching it) while holding the camera front down so that any specks of dust fall away from the sensor. Sometimes specks can stick (pollen for example) in which case you could try a disposable swab and cleaning solution, although if unsure most camera shops provide the service pretty cheap - the sensor would be a lot more expensive to replace if you mess it up.