We have a similar problem on our block of 8 apartments. Five are owned by Brits as holiday homes, one by a Russian family, again as a holiday home, one is still for sale, and there is one Turkish resident who rents long term off the owner. She refuses to pay any maintenance, but invites all her Turkish friends/neighbours over to use the pool. (They use our sunbeds and any pool toys/lilos that may still be out at the poolside.)
Not sure there's an easy answer to this one.