You are thinking of Mona Sax, she makes a brief appearance in the first game, but its in the second game where she shows up in most of the chapters (often showing up right before or after Max arrives to a location) and you play as in her in some of the later chapters.
Most high volume printing (like shipping labels) is done with thermal printers where the heat turns chemicals on the paper black. These chemicals usually can withstand water but not alcohol so spraying with pure alcohol and wiping off usually will blank the paper entirely.
You are thinking of Mona Sax, she makes a brief appearance in the first game, but its in the second game where she shows up in most of the chapters (often showing up right before or after Max arrives to a location) and you play as in her in some of the later chapters.