We’ve all tried at some stage to keep records of our favorite pedal settings and ended up with either writing directly on the pedals using big markers or using regular labels that would stick on the pedals for ever.
pedallabels.com has the answer: perfectly calibrated labels with an adhesive that makes them easy to remove and put back on (it works, I have tried). The full pack is only USD 7.95 + shipping. For this price, you get labels designed for all major brands (Boss, Ibanex, MXR) and 54 single knob labels as well. There is even a label for a 3 position toggle switch. You can find all the details on pedallabels.com.
Here are labels put on two of my pedals:
Here is the full line up: