Limit bath time. Hot water and long showers or baths remove oils from your skin. Limit your bath or shower time, and use warm - rather than hot - water.

"You come out and shower with the suit on to get loose contamination off, take off the suit and then shower again to get it off your skin," he said.

Taking a shower, having a long bath or going for a swim can increase the risk - albeit small - of absorbing THM through the skin, say the Spanish academics.