Cleaning interior glass has it's own challenges. I would bet every vehicle manufactured today has a moderate amount of plastic interior parts. This is OK because it makes manufacturing easier and less expensive plus the vehicles are lighter and safer. This is part of the problem in keeping the interior glass clean. Most plastic is made of some type of petroleum product, as it goes through temperature changes, (warming and cooling) it emits gasses. This process of releasing gasses is called outgassing, as far as I know all plastics do this.
Inside the vehicle the dash outgasses onto the inside of the windshield. Plastic door panels outgas onto the side windows. This gas leaves an oily film, mixed with the vapors the human body emits by breathing, cleaning the glass becomes more difficult.
When cleaning the inside windows, you need to think about this oily film. Glass cleaner alone will clean the glass but streaking will be common. I start the cleaning of interior glass with a Mr. Clean magic eraser. Using the hottest water you can stand, if available or just glass cleaner if not, clean the inside of the glass. The eraser will degrease the glass removing any oily residues. Then we can continue to clean as usual, waffle weave microfiber towel first to collect any leftover dirt. Then we use a smooth microfiber towel to finish polish and get any errant soil. That will leave you with a clean streak free window/windshield to see this great country through.
A few pointers, I have found a 16" x 16" microfiber towel is the best size for me. I fold the towel into quarters; I then have eight usable surfaces of towel to change too as the towel gets dirty. When using a towel do not allow it to touch any plastic, it could pull some of the oil and cause streaking. If you have an extra clean towel you can lay the ones you are using on it to keep them oil free. If you have overspray from the glass cleaner on plastic parts, use a different towel to wipe it up, but do wipe it up; it may cause premature drying out of the plastic.
One way to avoid overspray is to spray the towel instead of the glass; this method will work for most spray type detail products to avoid overspray. After reading about microfiber towels I learned some interesting things. You should never wash microfiber with any other type of cloth; the microfiber will "grab" the fibers of the other cloth and "will load up" rendering the microfiber worthless as a cleaning cloth. Never dry microfiber cloth in a dryer; unless using no or very low heat, heat will melt the fragile micro fibers in the cloth, again ruining the cloth as a detail cloth.
Microfiber is a very fragile yet tough cloth perfect for cleaning and polishing, however it must be taken care of properly. Washed using the right detergent and of course drying the right way. A good quality microfiber towel can be very expensive so proper maintenance and storage is necessary for a long and useful life. I store mine in a sealed container at home and in Ziploc bags in the truck. If one blows away and through the leaves and detritus of a parking lot; most likely it will be ruined. Buy good ones, take care of them and they will serve you well. Till next time, Be Safe Out There!