Clean quartz sink (Cristalite) without expensive care
Over time it forms in the quartz kitchen sink a gray coating that can not be removed with normal household cleaners. The Fa, who sells this sink, recommends a care system that costs as much as 30 euros.
I remove the gray coating with boiling water (1 liter) and with a splash of vinegar essence. Just put in the sink and let it work. After 5 minutes of exposure, the gray coating can be removed with a dishwashing brush. Drain the hot water.
Rub the sink dry and immediately rub in with gun oil (available for 1.25 Euro at the hardware store). The sink is again like new and the water is popping off again.
That's all and the cost is under 2 euros!
