I guess that's not really what you expected to receive. I would also be disappointed.
But don't worry, there is a couple of ways to clean those filters. I'll speak from my experience as I do this daily.
Alcohol will almost always leave streaks no matter how you apply it and if you blow it right off.
If you want to clean the filters mounted, then you can do that without the use of alcohol.
Blow everything you can using a rubber blower or a compressed air, very carefully.
You will then need a clean microfiber cloth. Start by gently wiping the filter glass to remove the stubborn particles. Make sure you always use different parts of the cloth.
Once all the dust/residue specks are removed, you can add a tiny little drop of pure distilled water to the cloth (not to the filter) and and start gently wiping the surface of the filter reducing the pressure slowly.
Keep doing this until the surface of the filter is completely dry.
This will typically remove all the residue that's left after cleaning with alcohol.
If this doesn't help, you will have to remove the filters and clean them using soapy water and then washing them under distilled water.
The only thing you should note before removing the glass is what side is AR coating is on.
Edited by asanmax, 19 October 2021 - 12:34 PM.