Mechanism inside the cars is completely waterproof - but the staff aren't

Red, blue and yellow electric cars for children are now in their 20th year

It's a tough job working at a theme park - and as these photos show, things are particularly gruelling for Legoland staff.

They claim the only way they could spring-clean their fleet of 40 one-eighth-size brick cars in Windsor, Berkshire, was to drive them through a car wash by hand.

That meant a bracing experience for the theme park's staff, who are preparing the Lego City Driving School to reopen for its 20th year on March 13.

The cars, which measure just 72cm by 144cm, where given a full valet service including vacuuming and hand-polishing ready for the big day.

Normally reserved for children as young as six, the Fiat-sponsored cars were taken on by some big kids instead for their first annual wash.

A spokesman said: 'There was no other way to drive them through the car wash. The mechanism's made to stand the British weather - but the staff got completely drenched.'

Drenched: These Legoland staff members drew the short straw in giving their driving school fleet a wash

Ready for action: The fleet of brick-style cars is being prepared for the children's driving school's 20th year

Colourful: Theme parks reopening are a sure sign of spring - but that didn't make it any warmer

Thumbs up: The staff members prepare to run the gauntlet of brushes and sponges near the family resort