Regularly clean off dirt from the frame, wheels and box etc., using a damp cloth.
Regularly inspect for loose parts and get any tightened by your dealer.
Lubricate all visible moving parts, cables, adjusting screws, moving brake parts (NOT brake discs), chain, pedals, bell and lock regularly with bicycle oil. Bolts and nuts also like a few drops of oil.
Check that the chain has the right tension.
Can be hand washed in lukewarm water (max 40 °).
Excessive washing weakens roof’s impermeability. Best is to wipe it lightly with a damp cloth or sponge.