Rights of use and obligations to maintain are separate questions
An easement gives one party rights over another party's land. It does not automatically follow that both share the maintenance, or that the owner of the land carries it alone. The terms recorded on title set out what applies, and they vary considerably between arrangements made at different times and for different purposes. Two neighbouring properties can be subject to quite different terms. Nothing about the way the driveway is used indicates which arrangement applies.
That is a title question rather than a cleaning one, and it belongs with each scheme's strata managing agent or whatever advice the owners take. What matters practically is that somebody establishes the position before a contractor is engaged, because a scheme funding cleaning of land it has no obligation over is spending owners' money on somebody else's asset. Establishing it takes one enquiry and settles the question permanently.
