TACOMA — A six-man cleaning crew with brushes and pressure washers is helping the Tacoma Dome shine again.

They’re a week into a job expected to last about a month, rappelling from the 150-foot tall cupola with 30 pounds of gear strapped to their bodies.

The News Tribune reports they’ve found tennis balls and a 9mm bullet in the gutters, which are mostly full of foul-smelling sludge.

This is the third time the 520-foot diameter roof has been cleaned. The last cleaning was in 2003. A private donor is paying about $104,000 for the work because the city couldn’t afford to keep its landmark clean.