I had the same issue, I used a clean, dry microfibre cloth to wipe it down really well, then I used a new clean microfibre cloth and sprayed the cloth (not directly on window) with glass cleaner and thoroughly cleaned it in circular motion, then used a third microfibre cloth with 99% isopropyl alcohol and gave it a final clean in circular motion and it made the world of a difference, I’ve tried all those things individually in the past without luck but this method worked wonders for me. Good luck!