Clean-vertising legal in Singapore?

I'm sure you have seen cleaners using pressure-water-sprays to clean the floors in public areas. Here's a great idea to leverage on their efforts, albeit probably not legal.

GreenGraffiti creates advertising on dirty city streets and walls using the clean, green power of plain water. Armed with just a template and a high-pressure water sprayer, the company has “cleaned” advertising messages out of the dirt on behalf of clients including Elle, Telfort and Universal Music.

No paper, no ink, no printing process—GreenGraffiti’s ads are completely carbon-neutral, it says.

They last up to six months, depending on foot traffic, and cost a fraction of the price of traditional outdoor media, the company asserts.

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