Who is responsible for cleaning gym equipment in a strata scheme?

The body corporate has a responsibility to maintain the common property. If you have gym equipment that would extend to keeping it clean.

Is this the responsibility of your scheme’s onsite managers? That depends on the terms of your contract with them. If cleaning the equipment is listed in the scope of works, they should be doing it. If not, perhaps it is a body corporate responsibility although you may also consider general cleaning clauses and how they apply.

For their part, the managers might say that cleaning gym equipment requires extra equipment/time as the cleaning required is different from, say, vacuuming a hallway. There may be an additional cost for this.

To get a copy of your contract with the caretaker, contact your body corporate manager. They should have one on file. They should also be able to review the relevant clause and give you their opinion on the matter.