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In this video tutorial, Phil demonstrates how to clean up text strings by extracting letters (both uppercase and lowercase) and numbers, as well as removing various characters. He utilizes the `text.remove` and `text.select` functions in Power Query, applicable in both Excel and Power BI. Starting with a table of random text strings, he guides viewers to open Power Query from the table data and rename the query to "text_select." He shows how to create a custom column for lowercase letters using the `text.select` function, specifying the desired characters to extract.