How do I treat the mange located on my dogs face?

My dog has sarcoptic mange and It is mainly on his face. The vet gave me mitactin to treat him, but how do I treat it on his face and avoid getting it in his eyes?

it is for sure mange….I already took him to the vet, that is how I got the dip medication.
the vet only gave him shots and issued the medication and told me to dip him every other week or every other 10 days. but you cant dip his head.

the easiest way it use a cotton ball and then swab it on.