Q 2: Is it permissible
to perform Tayammum (dry ablution with clean earth) using a painted wall?
It is permissible to perform Tayammum using a painted wall if there is clean dust on that wall, which can cling to one's hands. This is because Allah (Exalted be He) says:
...then perform Tayammum with clean earth and rub therewith your faces and hands.
This includes the clean earth that is found on walls and other items.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.