Sensor cleaning on your model is a job for professional technicians only and therefore not cheap. Dismantling your camera to get at the sensor requires specialist skills and knowledge and due to the small sensor size it must ideally be done in a sealed room with high levels of dust extraction if you want to avoid making the problem worse.
Any attempt at unauthorised disassembly will also invalidate any warranty you may still enjoy; even if the original warranty has expired there are sometimes camera faults which later arise that manufacturers have been known to retrospectively extend the warranty for so you potentially lose those rights as well.
A safer alternative is to use a supersonic vibration cleaner on the camera. These are sold to the public and to jewellers/opticians as a means of cleaning without chemicals and are usually filled with water, but you can find one with a large enough bed to sit your camera in and then it can be used dry. Your camera must be switched off when you try this, and must sit on it's base. The latter allows the dust to fall downwards and get trapped on the internal sticky dust trap built into your camera. If the camera is oriented any other way then you may dislodge trapped dust which may then fall onto the sensor. If you cannot find a suitable supersonic cleaning bath then you may even find that a ******** (yes, I DO mean the adult toy) set on it's fastest setting will achieve the same result. You need one that vibrates, not one that resembles an industrial jack-hammer...
Failing all that your only remaining option is to just accept that you're going to have to process out the artefact on every shot until it eventually falls off the sensor of it's own accord (no guarantee that it will though).
Good luck, and please take a moment to rate my reply.
Sorry, you can't take the lens apart.
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