SQL & PL/SQL

Dear Friends,

In our application, User copying some data from a document and pasting in a field "Comments".

If that data consists anything like bullets,arrows of word document. It is inserting some Non keyboard characters into database like below.

• Analysys
• Do
• Now
• When
• As
• We

don’t know how much he love sthe testing’I am not crazyh’

I AM ‘USER’ 



 Uu
 Yy
 tt

Now user asking to remove all those Non-ASCII characters from Comments Column. Please help!