A razor blade is the best in such cases, and a simple windows cleaning solution afterward. It should help.
This is one of the reasons I don’t like tinting – it’s not easily removable and doesn’t look that good when damaged. That’s why I prefer using magnetic fabric sunshades with extensive UV protection in my car. These are easily removable and protect the insides of the vehicle from sun radiation well.
The area where I live is rather gloomy, and sometimes, I want more light in my car. Tinting would make it difficult for me to drive on days that are already too dark to see well.