You'll need to create a custom cleaner.
To remove the timestamp lines, use something like this:
This regular expression will:
^ - anchor to the start of the line (since Match Lines option is set)
\d+ - match one or more digits (0-9)
[\d;\x{20}-]+ - match one or more digits (\d), semicolons (;), spaces (\x{20}), and dashes (-). You could write the space as a " ", but \x{20} is more cleaner if you come back to it. The [ ] allow you to specify characters and character classes. See Help > Regex Reference in TextSoap app for additional information.
\n - matches the EOL (TextSoap 9 uses \n to represent all end of line (EOL) characters internally, no matter what the line-ending style was originally)
The replace is blank, which will delete it.
So this will delete all lines with the timestamps (in the format you specified)
If you want to also delete any remaining blank lines, you can use an action like this:
This regular expression will
^ - anchor to the start of the line (since Match Lines option is set)
\n - matches the EOL
Again, the replace is blank, which will delete the match.
Hope that works for you.