In article , Bill W
wrote:

On a regular basis? Before every outing? Only when you actually see
something on the lens? When you see something on the photos? And do
you always clean both ends?

only if i see something worth removing.

dust makes very little difference. see lensrentals' tests.

And what method(s) do you use under what conditions?

lenspen.

Do you always carry a liquid cleaner with you?

no.