The Corolla was my first new car, but its come time to clean the instrument cluster plastic as dusting is no longer doing the job. So since it has no scratches on it presently, how do I keep it that way and get it clean? Any suggestions?
I take a terry cloth that is slightly damp and blot the dust off keeping the cloth turning each time (don't want to use the same part of the cloth over and over) then once its clear, more damp then clean dry cloth till done.
I just use my mini california car duster to clean my dash and gauge cluster. Depends on how much it needs cleaning, mine have only ever needed dusting..
What's wrong with it? You say no scratches, but more than dust? Are there smudges? Megs Quick Interior Detailer should be fine. It's doesn't sound like you need an abrasive here ("no scratches"). Just use a damp MF cloth. If there were scratches, or yellowing, Megs PlastX works good.
Up here in my region of Canada we get down around -40C occasionally each winter. A fogged mirror effect sometimes takes place occasionally on the instrument cluster as the car warms up and the snow in the floor mats melts...anyways dust mixed with this moisture creates water marks if you will over the period of a few cycles. I have never touched the IC with fingers either so there are zero scratches under these marks.
So no, I need the furthest thing from abrasives. The idea about the soft terry/micro fibre cloth and water really seems like the best solution as its least invasive.