For a thick coating of bugs, wet a paper towel or a microfiber cloth and lay it on the visor for some time. It will make the bug spots easier to remove. And spray the bug remover or helmet cleaner and gently wipe it with a microfiber cloth, and this should do the job.
Don’t let the bugs bother you, and keep the visor clean after every ride, even for a Supermoto helmet. It’ll increase the lifetime of the helmet and the visor. These pretty simple tricks should save your helmet and give it a long life.
Wipe the bugs off and make the visor as clear as new!