120W portable solar: works great! (and some questions)

We just got back from ten days in the Eastern Sierra – my new (well, “new to me”) 120 watt folding solar panels performed brilliantly. Easy to deploy, plug and play, and they kept the batteries fully charged, despite normal usage. Admittedly, these were perfect conditions – the panels were in the full, hot summer sun, with clear skies. But I was very impressed.

And now, the inevitable questions:

Do I need to disconnect the clips from the battery at night?

Is it harmful to leave the panels unhooked but deployed? I noticed that the red lights on the controller blink when I did that.

The panels seemed to attract dust and pollen, so I wiped them off once or twice a day. Is there a way to protect them from dust?

Can I clean the panels with Windex?

I’ve read that the controller is not rainproof, even though the panels are.
The controller is mounted under the panels, seemingly protected from the rain. Is there anything else that I can do to protect the controller? I don’t want to put it in a sealed plastic bag – I am concerned that it would overheat.

I am already planning a longer cable – it is now at 15 feet, which would be too short for most of our shady campsites. If I go to 25 feet, I know I will need heavier cable. Do I need to replace the cables running from the panels to the controller (which are a foot long), or just the cables running from the controller to the battery?

How long can the cable run go, from a practical perspective? I don’t mind the weight or bulk of heavier cable, if it will enable me to have 30 feet of cable or more.

Finally, has anyone built a platform allowing for easy rotation of the panels? Early in the day, I would like to point the panels toward the rising sun and then move them toward the south before leaving our campsite.

Thanks in advance for your advice!