You can use textract if the wads are embedded in the bsp file:
1) BSP file, randommapnamhere.bsp
2) Textract program --> http://www.superjer.com/files/textract.zip
3) Put them in the same folder
4) Open a command window there
5) Type: textract randommapnamhere.bsp randommapnamhere.wad
6) Then use your fresh new .wad
Hope this helps.
If the wads are not embedded, then they should be in your cstrike folder, I think.