I get constant camera dirty errors for the nozzle camera and the live view camera on this printer and I’ve cleaned both cameras very thoroughly. Any idea of the cause. Is annoying
Have you ever tried shining a flashlight on it to check whether the camera lens is still smudged or dirty? Sometimes the light reveals streaks or cloudy spots that you wouldn’t notice otherwise.
If the lens does turn out to be cloudy or scratched, there’s a special polish made specifically for plastic lenses. You just have to make sure you pick the right type so the surface doesn’t get damaged.
Just to be on the safe side, check to see if there’s very bright ambient light shining into the printer and confusing the camera.
Of course, it could be due to something else, but this is the cheapest and easiest option before you have to replace the hardware. 
check for wisps of “hair” from filament like PETG
it is not on the lens, but when seen through it looks like mist
if present it will be stuck to the nozzle silicone sock etc