Or start a notebook with the details in and keep it in your car!
I keep a tote bag in my truck all the time, complete with any fabrics or patterns that I am kinda-sorta looking for or to coordinate with, but not in a rush to find. Also, a OBW mirror, and an address book with LQS info, filed according to town. You wouldn't believe how often it has all come in handy, whether locally or at a distance.