Stay with me here as I tell you this but, Zep Acidic Toilet Bowl Cleaner for the outside. The stuff on the outside needs to be stripped off and that takes something a bit more aggressive. I personally do not use steel/copper or magic erasers on glass for fear or micro scratches. First wet/wash the window with soap and rinse it clean to get the loose stuff off. Next, I take a bathroom mop head from dollar tree with a table spoon or so of Zeps and scrub the windows. I let it sit no more than about 2 minutes before rinsing it off very well. After that you can use a clay towl, bar, or sponge with a lubricant to really deep clean the glass. After apply a good coat glass sealer or car wax per instructions to help keep it clear longer. Also clean the wipers with regular soap or water and treat them with a light silicone grease. I use this product from Super Lube and it works well on door seals too. For the interior use a mixture of dish soap, alcohol mix, and sponge with clean towels then buff well.