The Piko loco will 'polish' the track, rather than clean it. - Which the LGB unit will do..
You will need to go round, remove twigs and other debris.
It will not deal with baked-on Bird-lime, and will struggle if you have problems with tree sap.
It relies on the pressure of the springs on the skates, which is not great.
It will help if you run fairly regularly, as there will not be a great deal of oxidation on the track.
PhilP.