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Hi there, Rod
I'm not too fussed about dew. I've had ice form on the objective before when I didn't put the dew heaters on correctly. Just make sure to dry it up as soon as you can.
If I ever need to clean the objective, first I try and blow off as much dust as I can with my Hurricane air blower. You can use a rocket blower to similar effect. Once that's done, well it's up to you! I've used lens pens, microfibre cloths (specifically for glass), and the brush side of lens pens as well.
All of them work. What I don't recommend is using isopropyl. I know it gets advised a lot, but I can never ever get rid of the streaks.
Fungus forms if you have humidity. It's actually usually formed inside the tube because there's rarely ever any air flow there. Fungus doesn't like dry air so any moisture build up inside will encourage fungal growth. It isn't too difficult to clean in an OTA unless it's a petzval as you can reach in from the back with say a long tube with a cleaning cloth at the end and clean it that way. Very difficult on a camera lens which would require dismantling of the unit. That said, I wouldn't want to have to clean it at all. Best to keep your scopes stored in a nice dry place away from moisture.
That's my 2c. I'm sure others have their own ways of cleaning their stuff. I've been using these methods on my photographic equipment for years.
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