السلام عليكم ورحمة الله وبركاته أحسن الله إليكم Can one do tayammum with the grey dust that builds overtime on objects? When I was 12 I did tayammum with it, do I repeat the salah? Also my beard started growing at that age.

Ustadh AbdulAziz al-Haqqan

Dust counts as saʿid if it is earth dust that clings to the hand, and tayammum is void outright while water is available.