Here are some maintenance tips for different reading light materials:
Glass: maintaining glass shades requires regular dusting. Otherwise, they’ll begin looking grimy quickly as the lightbulb heats the surface. If grime does appear, clean the shade with a solution of warm water mixed with a mild detergent using a soft cloth.
Fabric: wipe down its surface carefully regularly with a soft cloth. If spots appear, gently rub them out using mild detergent and a soft cloth.
Metal: don’t use a spray cleaner on its surface. Instead, keep it dust-free and spot clean the shade with warm water.