Why is the La Specialista Arte steam wand not performing as well as before? I noticed the foam is not the same as it was when I just purchased the machine.

It is important to clean the steam wand every time you use it to minimize build up of milk residue. Simply flush the steam wand by pointing the steam tip into the drip tray and turning the steam on for a few seconds. Then wipe the steam wand clean with a damp cloth.