If your taps at room do not look shiny, it could be due to these primary reasons:
Over a period of time, limescale, a hard, chalky deposit of calcium carbonate, accumulates in the edges and filters of taps, and causes small blocks that disturb the water flow.
Dirt accumulates easily on the tap surface, due to the environmental conditions. Also, since it is the most touched part of the tap, dirt accumulates there, which needs to be cleaned from time to time.
Hard water stains:
In places, where hard water is supplied via pipes, the salt deposits get accumulated on the surface of the tap, thus leaving brownish stains.