How do I remove moisture from inside a camera zoom lens?

Take it to camera service right away. If you leave it too long, it will leave stains. Next time, put your gears into an airtight box with moist absorber inside.

You may have to bring it in for repair. If there is moisture in between the lens it will have to be taken apart, dried, and resealed.

You can try putting it into a sealed plastic bag with silica gel and see what happens.

Depends what type of camera but if you can get access to the inside of the lens (not necessarily removing it ) leave in a warm dry place, not too hot to let it dry out and still in that area close it up again. DO NOT rub it.

this happened to mine, i put it on atripod, you could use a box , i put it in the airing cupboard or a warm room for 2 days.
i breathed hot air on my cameras lens and left it outside in the wind and it dried out