I doubt you can take subs off the clips if they are on the video itself .. all i can think of is blurring as well DARKSTAR
Dont know if it possible to do with Vegas but try looking at those two sites http://zuggy.wz.cz/guides/video.htm http://www.compression.ru/video/subtitles_...l/index_en.html
you cant delete the text because its compressed into the video if you had the project file you could and also i dont recommend sony vegas i bought it and it was a waste of money try powerdirector its a little easier and works better