Wa `alaykum as-Salamu wa Rahmatullahi wa Barakatuh.

 

You are allowed to use any safe method or device that does the job: removing the unwanted hair.

 

There is nothing in the sources to forbid the use of razors as long as they are considered safe and efficient.

 

In such matters, we may do well to recognize the established juristic principle: All things are permissible unless proven to be forbidden. Or stated differently, permission is the rule and prohibition is an exception.

 

In conclusion, you may resort to any safe and efficient methods of removing unwanted hair.

 

Allah Almighty knows best.