Turkish Airlines, at their IST hub, has a nice array of lockers in the business class lounge where you can stow your carry-on while spending the day touring the city.

I will soon have 14 hours in Abu Dhabi between Etihad flights, and lounge access. Does Etihad offer a similar facility where I can entrust my bag?

Or failing that, is there something reliable elsewhere in the airport?

Also how is the shower situation at the lounge? Do I need to arrive extra-early at the airport to be assured of getting a rinse before my next flight?