You can do another thing for the stubborn dirt, soak a microfiber towel in warm water and lay it over the visor. After a few minutes, the dirt spots should be soft enough to clean with the cleaner. If you do this, cleaning your helmet will be a whole lot easier.
To make a visor last long, it’s important to clean and maintain it properly. Especially because it’s a safety gear and it’s risky to drive while using a dirty visor. Keeping it clean every time you ride can expand its lifetime, a stitch in time, saves nine.
Take care and have a good ride!