Who is the Blue Mountains 'bubble man'?

The search is on for the Blue Mountains "bubble man" who spends his mornings bringing a dose of cheer to work-bound drivers.

A listener wrote to 2GB's Ben Fordham describing the morning ritual that takes place for drivers in Blaxland.

Every morning at about 7am, the listener's daughter Monique spots a man on a footbridge over the road, making bubbles that pass over the cars.

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"He's there morning after morning and it brings a smile to her face," the listener wrote.

Monique eventually bumped into the same man at the shops.

After thanking him for her daily dose of cheer, she asked him why he did it.

"He does this every morning to do exactly what she said - to make people smile," the listener wrote.

Fordham seemed keen to know more.

"Can we find the Blaxland 'bubble man'?" he said.