Washing oneself with water used to wash a deceased person

Q: I ask Your Eminence to elaborate on some matters that are unfortunately common among some families here in Al-Madinah Al-Munawwarah. For example:1. When a woman in the post-childbirth period enters upon another woman in post-childbirth, the latter is exposed to Al-Kabsah i.e. The milk will be pressed in her breast, or she will not give birth to other children unless she washes herself with water used to wash a dead person, or she walks on that water, or walks over seawater, or washes herself with the used water of this woman after having a shower while she is in the state of post-childbirth for three consecutive Fridays at the time of the Friday (Salah) Prayer.2. If there is more than one bride in a wedding, the second should not enter upon the first lest she may take the luck of the first bride. To avoid all the previous cases, there is a necklace called "Al-Mushakhis" worn by women to protect them from Kabsah.3. No traveler who has just arrived or person who has come from Al-Baqi` is allowed to enter upon a woman in post-childbirth, lest she should suffer Al-Kabsah. (Part No. 26; Page No. 302) 4. It is the custom of some families here in Al-Madinah Al-Munawwarah to specify certain days for consolation whereas no one is allowed to go during other days, and on other days in which a person who wants to show consolation wants to go, they should go after the Maghrib Salah (Prayer).5. When someone dies and people go to witness his funeral procession, they should not leave the house until Al-Salab returns. Al-Salab are men who went to attend funeral processions in Al-Baqi`. They think that it is a bad omen for the members of the family and another person may die of the same family if they leave the house.Finally, kindly accept my respects. May Allah reward you.