Gum Wall, with about 150 pieces per brick, getting scrub down

Big changes are coming for the famous Gum Wall at Pike Place Market in Seattle, Wash.

For the first time in 20 years, the market plans to clean all the gum off the wall. Pike Place Market says a total scrub down is needed because of the sugar in the gum.

Market Theater's walls in Post Alley will be steam cleaned starting Nov. 10.

The cleaning is expected to take multiple days due to the volume of gum on the walls.

Once the wall is clean, people will be allowed to put gum back up again.

The Gum Wall has grown to eight feet high and over 54 feet wide, with approximately 150 pieces of gum per brick.

Photos: View the Gum Wall

According to Pike Place, an estimated one million gum wads cover the wall.

It was started 20 years ago by people waiting in line for a late night improv show.