(WTOP) A high-tech method using lasers to clean a grimy black coating on the Jefferson Memorial’s dome has proved so successful, officials now want to give the rest of the monument a laser scrub-down, the National Park Service said Tuesday,

The park service partnered with the Chicago-based conservation firm Conservation of Sculpture and Objects Studio last month for a four-week trial run of the laser-ablation treatment.

Park service officials are “very satisfied” with the laser treatment’s performance during the testing, architectural conservator Justine Bello said in a statement.

“The level of clean that was achieved exceeded our expectations,” she said in the statement. “We were able to clean the stone in a safe manner that protected both this cultural resource and the surrounding natural environment as well.”

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