Do you have streaky white precipitates develop on your glass where water drips and dries? How do you have perfectly clean glass to clearly view your fishes and to make photographing fishes easier?
Do not use any chemicals or sprays as it could be harmful to your aquarium inhabitants. The safest way to do it is…
Dissolve the salt precipitates with a cloth soaked in warm freshwater. Then wipe dry with scrunched up newspaper.
You can also use white vinegar on the exterior glass surfaces to dissolve the salt. Then, warm water, followed by newspapers.