On Fri, 17 Apr 2015 02:05:01 -0700 (PDT),
wrote:

My husband wiped the car with Armor All including the glass/plastic that covers the speedo. Now there is permanent foggy parts on the cover. Any solutions?

Is the "fog" inside the case or outside? Sometimes dashboard
instruments get fog on the inside, actual fog from actual humidity, but
maybe it doesn't get noticed most of the time and you're noticing it
this time because you paid attention. If the inside, I'd let it dry
for a few days.

If the outside, does rubbing your finger over the cover make it appear
different? If not, maybe it's really on the inside. If it does, I
would wipe off the armor all with a slightly wet maybe soapy cotton rag,
or whatever the armor all suggests using) and again I'd let it dry for a
few days.

I would not use Brasso until I had tested it on a piece of similar
plastic, and where you can get similar plastic I'm not sure. I have
Brasso and similar products and my long ago admittedly vague
recollection is that they scratch things up before they start to even
out the scratches. Also, fog and scratches don't sound like the same
thing to me.

What I would use for polishing plastic is denim. Like blue jeans are
made out of. With nothing else. Worn denim** might give even a finer
finish. Unfortunately, it's the car so you won't want to just sit there
rubbing it for an hour while you watch tv, like you could if something
small and portable needed polishing.

**Maybe some other cotton fabrics like canvas work too, but the one
success I had with plastic was using an old piece of denim.