Rome, Italy

Colonnades in St. Peter's Sq.

Builder: Gian Lorenzo Bernini
Built in 1656–1667

Building Material:
Travertine (248 travertine columns with an area of more than 25,000sq.m.)

Type of Soiling:
environmental pollution (traffic)

Cleaning Equipment:
Blasting Gun with steam mode (abrasive, water, steam, pressure and temperature can be varied)
Abrasive: Calcium Carbonate

Duration:
1998

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