I went to ask him if he could clean and repair a pair of Premiata boots worth over €700 because the leather had become moldy, and his response was that I should clean them myself with soap and water. I'm actually grateful he didn't take the job; with that lack of skill, he would have damaged the leather even more.
If you have luxury items that require special treatment, keep in mind that there aren't any good shoemakers in Marbella.