You can buy a heat gun for $20-60. You may be able to rent one from your local construction supply store for $10-15, though.

The tint should get hot enough that you can’t touch it for more than 2-3 seconds. Keep your hands off of the glass after you’ve heated it. Do not heat the window from the inside. You will damage your window tint if you do this. If the mistake is in the middle of the window, heat it directly. If it’s within 3–4 inches (7. 6–10. 2 cm) of the edge of the window, heat the area just outside of the mistake so that the heat gun is slightly closer to the middle of the window. The heat gun will melt the trim or plastic around the window if you heat it directly. [3] X Research source

You can move the bubble or wrinkle out by pushing the problem to the top, bottom, or sides of the window. It doesn’t really matter. Just choose whichever edge is closest to the mistake. For wrinkles and creases, hold the straight edge perpendicular to the line in the tint. If the bubble or wrinkle isn’t moving at all, heat it for another 3-5 seconds.

If there is debris trapped in the window or the mistake is so bad that you can’t get it to the edge of the window, you may need to replace the tint. Repeat this process for all of the bubbles, wrinkles, and creases in your window.

If a professional shop installed your tint and there are visible mistakes, they’ll usually fix it free of charge.

If you’re going to pay a professional to replace the tint, you can always take your vehicle to them and ask them to remove it. You’ll save yourself $15-30 in labor if you do this yourself though, and it’s not particularly hard to do.

The plastic insulates the window as the sun heats the glass up. The adhesive will melt while it sits out on the sun and make removing the plastic easy. You can achieve the same effect with a heat gun, but this is much easier and safer for your vehicle.

It typically costs $100-400 to tint an entire vehicle, but it will cost considerably less to get a single window replaced.

Tinting a vehicle is a pretty touchy process. If your first attempt to tint your windows was unsuccessful, you likely got enough practice to nail the process this time.