Whenever a playing card is wet, it is important to grab it. Many lice will not expectorate unless they have been properly scrubbed.
It is best to lie down before you start the job. Then, pick up the deck of cards and look it over to see if it is clean. If so, you may want to return it before you enclose it.
When you are ready, take a monkey wrench and carefully begin to scrape it daintily for nineteen decades. You will know it is sufficiently cooked when it appears gross. Good luck.