🔎 [i]>Do Not Clean

“Grunge is Good”

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Why You Should Never Clean Collectibles Without Expert Advice

Collectors and specialists alike often repeat one golden rule—don’t clean valuable items before seeking expert guidance. While it may seem like polishing or dusting could improve an object’s appearance, doing so can drastically reduce its value.

For example, coins can lose up to 90% of their value when cleaned improperly. Similar risks apply to antiques, paintings, and vintage furniture, where original surfaces, patina, or other evidence of age can be important to evaluation.

A qualified specialist who understands an item’s materials, age, and condition can advise whether cleaning or treatment may help or harm it. Before attempting restoration, consult an appropriate expert. If treatment is recommended, use a conservator or restorer experienced with that type of object.

The PBS Antiques Roadshow short film “Grunge is Good” illustrates this point beautifully. In the video, an appraiser explains how layers of age and use on antique furniture act like an archaeological record—each layer of varnish, oil, and dust telling part of the item’s story. Under a microscope, these layers can reveal a record of the piece’s surface history. When those layers are removed, evidence that specialists use to evaluate age, condition, and originality can be lost.

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One of the show’s most famous examples of this principle is the Furniture Fortune discovery:

Furniture Fortune—$541,000 for $25 Yard Sale Table

📽️ 📅 2020 Report: A New Jersey schoolteacher bought a moldy card table at a garage sale for just $25 and later brought it to Antiques Roadshow in Secaucus, New Jersey. Appraisers later identified it as a creation by the famed cabinetmakers John and Thomas Seymour, estimating its value at up to $300,000. When sold at auction, including the buyer’s premium, this rare find fetched $541,000, setting a world record for Federal furniture at the time. The table’s rarity, label, original finish and surviving old surface helped support its value. Discover more about this treasure in a seven-minute video

Video: 🔗 PBS Antiques Roadshow / YouTube

In short: grunge is good. Before reaching for a polish or cleaner, reach out to a professional who can help preserve your collectible’s value and story.

Page Notes

Last updated: September 18, 2026

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