Mark on photos

Not very descriptive I admit.

I now have two marks on the top left hand corner of each photo I take. The camera is a K-50, and these marks occur on any lens I use.
I`m very much a novice to this so I don`t want to cause any damage but I`d appreciate any guidance on where I could clean (if possible).

I`ve cleaned the lenses, viewers and air blown the inside of the camera - is there anywhere else ?

Many thanks

David

I would guess that it is something on the sensor, especially if its in the same area of an image, and using different lenses.
I'm sure someone more knowledgeable will be along soon, and possibly give you advice on how to clean it, if that's what it is.
I have never leaned a sensor, so would be reluctant to offer advice.

I have never had K-50 in my hands, but it is possible there is some "sensor cleaning" mode within its menu. It would expose the sensor (lens detached) giving you a good opportunity to use your air blower. If it won't help, wet sensor clean is required

Many thanks - now fixed.

I had a look at various other previous posts and took guidance from them.
Sensor has now been cleaned and whatever is was has gone