Replace mutiple strings in a calculated field using sugar logic function: strReplace()

I am using the below to replace a string which works well

strReplace($mft_part_num,"",$name,false)

However some of the parts start with a dash " - " which I also want to replace witrh blank.

This is not working,. 

strReplace("-","",toString(strReplace($mft_part_num,"",$name,false)))

Does anybody have any sugestions please