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Agreed. Any grime on the objective would be too unfocussed to be visible like that on the image. It must be on the sensor or something closer like a cover glass on the sensor compartment.
I cleaned my TAK objective for the first time in 6 years recently after being similarly reluctant and it was simple and safe. Make up a small batch of 60% isopropyl alcohol (Diggers brand from Bunnings), 40% water and one drop of plain dishwashing detergent. Dab on with no pressure with soft tissues with no additives. One gentle wipe and dispose of each as you use it. Don't put excess liquid near the edges. In the end it was easy and very effective.
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