A British teenager has some scrubbing to do after his parents discovered he'd painted an 60-foot-long penis on their roof to get his home noticed on Google Earth.

Rory McInnes, 18, decided to make his family home stand out after watching a documentary about Google Earth.

Armed with a bucket of white paint, he climbed on top of the $1.5 million home in in Hungerford, Berkshire, southern England and set to work.

His artwork remained unnoticed for 12 months until a helicopter pilot spotted it and swooped down low so his passengers could take photos.

Dad Andy thought it was a prank call when a British newspaper contacted him about the painting this week.

"It's an April Fool's joke, right? There's no way there's a 60-ft phallus on top of my house," Mr McInnes told The Sun.

• Click here to read the rest of this story in the Adelaide Advertiser (warning: cartoonish depiction of penis).

• Click here for the heavy-on-British-slang original Sun story (warning: same childish drawing).