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How to make the hemisphere bell glass become hydrophobic?

hello! I recently met a problem. When I see the video recorded from the QGC, I find a lot of water drop in the picture.
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Do you know how to remove the water drop? Thank you very much!!

We normally get this on the first dive of the day, air bubbles on the dome - best solution we find is to just have gain to 100% and dive down a metre or so and then yaw side to side a couple of times - this normally clears them. Then switch to lower gain for more control etc.

Thank you for your reply!! I’ll try it later

If problem continues with depth - try a smear (very light) or washing up liquid on the dome to break the water surface tension

Thank you for your reply!! I tried some nanomaterials, but it did not work. Do you have any recommendations? Thank you very much!!

I just use “fairy liquid” but any washing up liquid is usually fine, trick is to only have a very light smear of it I’ve found (cleans the scanning sonar transducer dome nicely also if used there!)

Try to use regular dishwashing detergents over the dome ( use a soft cotton embebed to spread )just before the dive

Thank you for your advice!!

Thank you for your advice!