I did... Who knows what's in there after the manufacturing process!
I washed the taps in soapy water then rinsed. Then I ran a keg worth BLC through the lines and taps when I finished my Keezer. I then ran a keg worth of fresh clean water through the lines and taps. Some may do it differently. But I wanted to make sure everything was working, no leaks, drips, or issues. And it allowed me to clean everything and get it right w/o ruining a few gallons of precious home brew.