A Muslim must fulfill the following conditions in order for the ablution to be valid: 1. Islam 2. Sanity 3. The age of discernment (around 7 yrs) 4. Intension. Intend in your heart that you’ll make wudu’; uttering the intention is against the sunnah. 5. Purity of Water 6. Removal of impediments. water must reach the skin. (Remove nail polish, paint, dough …etc. from the wudu’ parts) 7. Abstaining from the invalidators. I.e. you cannot urinate or release gas whilst making ablution.