Spark Plug Wires

I have a set of 64 Race Hemi plug wires that I would like to clean up. What is the best cleaner to use on these that will not harm the lettering.

Thanks
Dan

I've had good luck with WD40 in the past. I just cleaned up a bunch of NOS wires-the black ones w/yellow lettering & had no problems.

Thanks, that was one of the options I was going to use. Just checking to see what others have used, thought maybe someone has found something better.

Dan

Can you please post a pic of the spark plug end? Whatever you do , do not use brake cleaner. Even a mild silicone spray will take the print off.