The disclosed powder composition comprises: (i) 5 wt% to 30 wt% anionic surfactant; (ii) 0.5 wt% to 10 wt% water-swellable polymer; (iii) 10 wt% to 30 wt% salt of Sodium which is either Sodium sulphate or Sodium silicate or a mixture thereof. The composition further comprises 45 wt% to 80 wt% stabilising agent which is either solely an abrasive with Moh's index of at least 3.5 or a combination of said abrasive and a water-swellable clay, where for every part by weight of said salt of Sodium, the composition comprises 1.5 to 8 parts by weight of said stabilising agent.
