Removing all the "bigskip"'s of a document

[Horacio Emilio Pérez Sánchez]

Hi,

I use LyX 1.3.5, and I have a big document someone passed to me to work 
with. This man likes to add a lot of extra spaces using the feature 
"bigskip" which I don't like at all. So I want to remove all of them.

Is there an easy way to do this in lyx ?

Thanks!