I ordered some white PVC flex to replace a pendant lampholder.
Unfortunately when it came it turned out to have conspicuous 'dot matrix'
style black printing along the length. This makes it unsightly for
something that's going to be on display, and there's no part without
printing long enough for what I need.

I tried rubbiing the ink with water and then IPA, to no avail. I could
sand it, but the rough surface would then be a dust magnet.

Any ideas what kind of solvent might clean it off?

Thanks
Theo