MOTEGI (AFP) - Reigning MotoGP champion Jorge Lorenzo said Saturday he was using bottled water to wash himself to avoid showering in tap water in Japan, as many racers voice concern about radiation exposure. The admission by the Spanish Yamaha rider came while many top riders remain worried about radiation leakage from a crippled nuclear plant some 130 kilometers (80 miles) northeast of the Twin Ring Motegi circuit. "I shower with bottles," Lorenzo told a press conference, raising his arm above his head to show how he washes himself using bottled water. Many teams brought their own supplies of water and food to Japan amid the perceived risks of radioactive contamination after the March earthquake and tsunami triggered meltdown and explosions at the Fukushima Daiichi plant. It was the world's worst nuclear disaster since Chernobyl in 1986.