Good wire tagging material...
Use one of those labelmaker machines like the "P"touch
or the Dymo letra tag
Brother P touch
Dymo Letra tag
Both these machines make flexible plastic labels that last a very long time. I put one on the food cart (using "standard" label tape) and it has been exposed to the weather for 3 years. NOW I do need to replace it but 3 years of being exposed to sun, rain and it still is readable. This particular label also got wiped several times a day with a mild bleach solution.
If you decide to get one of these (or any other brand) label machine, check the prices andavailability of replacement labels not just the original machine price. I bought my Dymo Label Manager 210D
from Wal-Mart several years back. Shortly after I bought it, Wal-Mart stopped stocking the label tape. I now have to buy it online
or at Office Depot ($23 to $27 per 23' tape cassette). With shipping getting so high & Amazon charging taxes now, it's getting to the point where it will be cheaper for me to buy a new label machine with a more popular tape. I have found these smooth super flexible labels to be VERY handy. I labeled my computer cables and connections with it. No more masking tape labels falling off or becoming unreadable. I go label mad with the things. Great for labeling the electric panel box or labeling the water filter with the brand & model # plus a few model #s of the filters we typically use because we only change filters twice a year... I can't remember the brands we can use so I write it down.... someplace. I also used the Black-on-White tape to label the shift positions on the bus' backlit automatic shifter. Works nicely. We don't normally drive at night, but you can see the diffused light and it makes the black letters stand out.