the Schwalbe, and other EU tires are coming with a reflective band on the sidewall these days ..

decades ago from a shop in NL I bought a pack of 2 rings of reflective tube ,

SIZED like you'd have as the sleeve in the cable housing, with a wire through it.

it laced in amongst the spokes , being above the rim it didn't get cloudy
from road dirt and aluminum off the rim, wet braking

like the strip in the tire sidewall does . so, now, the sides of the tire need cleaning occasionally .