Cheap clean inside glass?

Nope !!!!! , I've got tinted windows and started using invisible glass on the tinted windows and windshield

 

Any of the Foaming glass cleaners work well unless in direct sunlight, then it evaporates quickly. Otherwise I use either ONR, Megs D120 or Vinegar/Isoporpyl Alcohol/Distilled water mix. If you use any dillutable chemical then use distilled water...this will help eliminate water spots if it dries. Also, the Megs D120 will last FOREVER and smells like blueberries! Mixes 10:1 and you can only get a gallon, also strictly adhear to the dilution ratio or you can get some streaks as well.

These towels have been a life saver also. When you wash microfiber towels use ALL Free and Clear and if they are really bad, a little bit of dawn or pre-soak. Dry on LOW (anything over 140 degrees can start to melt the microfibers and will not absorb anymore) with NO DRYER sheets,NEVER use a softener of any kind or powder detergant.

https://www.theragcompany.com/premium-korean-microfiber-16-x-16-blue-glass-and-window-towel/

 

Invisible glass (the pressurized aerosol one) is the best I've found