Un zip one of the cushions and look at the backing, if its suede the backing will be leather.
If its fabric or like a white thin sillicon material its faux, i have never come across a real one in 17 years, cleaned loads of faux, in fact cleaned one today.
Nemesis and towel, extract and towel again to reset the nap.
Avoid solvents, including Fabric restorer and keep the temp down to avoid damage.
Mark