A stained glass shade collects decades of dust, kitchen grease, and smoke film — and every well-meaning cleaner before you has left a story in the surface. The glass itself is nearly indestructible; what you are actually cleaning around is the assembly: the copper foil or lead came holding each piece, the solder joints, and often the original patina the maker applied on purpose. Cleaning wrongly damages all three. Here is the order that works.
Ninety percent of shade cleaning is dry cleaning. Use a soft, clean paintbrush (a one-inch bristle brush is the collector's standard) to dust every pane, working from the top down so loose dust falls out of the shade rather than across the next pane. Follow with a dry microfiber cloth on the flat surfaces. On a shade that has only ordinary dust, stop here — the glass should already read brighter, and you have risked nothing.
Skip the feather duster entirely: the quill ends scratch soft old glass, and the flicking action drives dust into the foil seams.
The short list of shade-killers:
For grease or smoke film, dampen (never soak) a fresh microfiber cloth with distilled water and a single drop of mild dish soap, wring it nearly dry, and wipe each pane in one direction. Follow immediately with a second cloth wrung from clean distilled water to remove the soap. Work pane by pane and dry as you go — standing water at a foil edge is the enemy.
If a pane still looks cloudy after a proper damp pass, stop. That cloudiness is usually inside the glass (a trapped bubble, a firing bloom) or on the reverse face you cannot reach — not dirt, and not fixable by scrubbing. Scrubbing a firing bloom turns a characterful antique into a damaged one.
Some shades — particularly early electric and boudoir styles — are lined or are paper shades altogether. Those follow a different rule: dust with the brush only, and do not introduce moisture at all. A paper shade with a stain is a restoration candidate, not a cleaning job; water rings on paper are permanent.
Three conditions mean hands off: loose or lifting foil and came (the pane moves when pressed gently — the assembly is failing), visible hairline cracks radiating from solder points, and any shade that still houses its original wiring if you intend to light it (the cleaning visit is the right time to have the socket and wiring redone properly). A stained glass restorer re-cements and re-solders a tired shade for a fraction of what a careless cleaning costs in value.
Readers browsing stained glass, paper shades, and oil lamp care pages are the exact people standing in an estate sale holding a dirty shade and a bottle of window spray. The directory tells you what the categories are; this guide keeps the shade you just bought alive long enough to become the piece someone else's guide writes about.