A controversial video is widely circulated on various websites, showing former U.S. President George W. Bush wiping his hand on his counterpart Bill Clinton's shirtsleeve after shaking hands with a man during their humanitarian visit to Haiti.

On March 22, the two former U.S. presidents went to visit the survivors, who suffered from strong earthquake in January, at a large homeless camp in Port-au-Prince, the capital of Haiti.

But, after shaking hands with a member of the crowd, Bush seemingly rubbed his hand on Clinton's shirtsleeve, the New York Daily News reported.

The Clinton-Bush Haiti Fund has raised 37 million U.S. dollars from 200,000 donors, including American president Barack Obama, who donated money from his Nobel Peace Prize award.

But Bush seems to be very careful about his personal hygiene.

In his memoir, Obama recounts his first meeting with Bush, in early 2005: "Obama! Come here and meet Laura. Laura, you remember Obama. We saw him on TV during election night. Beautiful family. And that wife of yours -- that's one impressive lady.

"The president turned to an aide nearby, who squirted a big dollop of hand sanitizer in the president's hand. 'Want some?' the president asked. 'Good stuff. Keeps you from getting colds.' Not wanting to seem unhygienic, I took a squirt."