(Cover) - EN Showbiz - Zac Efron "revoked pool privileges" from his friends after they trashed his backyard.

The Hollywood star will be away from his Los Angeles home over the coming months due to a hectic movie schedule. He knows his pals enjoy hanging out at the palatial property so invited them to use the outdoor swimming pool in his absence. However, he was horrified when he received an angry phone call from his parents about the situation.

"The place looked like a bomb had hit it," a source told National Enquirer. "His pals had turned his backyard into a filthy mess filled with food, wrappers, cans, bottles, towels, paper cups and things. Zac, totally upset, immediately ordered the locks of his gate changed then phoned his buddies and told them their pool privileges were revoked."

It's not known how Zac's friends reacted or who cleaned up the mess.

The property has been an almost constant source of worry for the 23-year-old star. Last year the swimming pool overflowed and flooded his house while he was away, while a family of raccoons set up home in his garage during another of his trips. (C) Cover Media