Police in Portland have released new images of an Aug. 20 robbery at the ScrubaDub car wash and are asking the public to help identify the robber.

The man entered the business about 9:15 p.m. and demanded money, threatening a clerk with a large knife. The business also serves as a gas station and small convenience store.

The man then ran off.

Surveillance video shows a light-skinned man in his 30s or 40s. He was wearing a blue Red Sox baseball cap, a red hooded sweatshirt with a design on the chest, jeans and tan work boots. He was seen riding a bicycle in the parking lot just prior to the robbery.

Police continue to investigate a similar robbery of Bimbo’s Bakery at 1037 Forest Ave. that occurred on Aug. 23. In both incidents, the robber was armed with a large knife.

Anyone with information about the robber or either robbery should contact Portland police at the anonymous tip line at 874-8584.