Text Truncation Help

I need to parse a file, and truncate some of the text I am coming across.

For example I get:
     Prefix:OptionOne
     DifferentPrefix:AnotherItem

And I want the following output
     OptionOne
     AnotherItem

But I’m not sure how…or even what to look up.
The only common denominator is that I want to drop everything before and including the colon.

Thoughts?