Hydro jetting blasts debris down with water while snaking makes a hole in the blockage and opens up the line.
Snaking by itself doesn’t clear out grease. Most often, snaking and hydro jetting work hand in hand. For just a greasy line, you need hydro jetting, as snaking alone chooses the path of least resistance and soft deposits can simply move down the line and collect residue later.
We do snake the pipe before hydro jetting to avoid flooding the home in the case of a tough blockage where water alone can’t get through. Snaking gets the line open, and hydro jetting will provide a permanent fix, removing the blockage.