Which planet does a detergent or chemical company represent?
Chemicals, natural or artificial, belong to Mangal (Mars) and represent the South.
Related questions
Does a toilet in the North-East always cause cancer, and is every South-facing house bad?
No. If it did, the owners of five and seven star hotels, which commonly have toilets in the North-East, would suffer first, and every South-facing owner would be ruined. Vastu must be read together with the planets of the person, which are exalted and which debilitated, instead of blindly applying one rule to everyone.
Does being manglik stop a person from sleeping in the South-West?
Manglik has nothing to do with it. It is considered only at marriage matching, when Mars sits in the 1st, 4th, 7th or 12th house, and Mars is power, not inauspicious. For the SW check whether Rahu-Ketu are debilitated, and for the South whether Mars is bad.
If a house has four members, whose kundli should be used for its vastu?
Primarily the grih swami's, the person whose money is going into the house, because the house affects the owner and his next three generations; do not go by the name the property is registered in, such as a daughter. The facing and main door are chosen from the grih swami's chart, for example North if his Mercury is exalted or his North-side planets are strong. Where a child sleeps or studies is decided from the child's own chart: if the child's Mercury is weak, seat him in the South instead of the North, following the 180-degree rule for a weak planet.
If the Sun is exalted in the 10th house, should the South also be improved, or should Sun items go only in the East?
Sun items go in the East, but they can also go in the directions of the friends of the Sun; one colour or one showpiece is not restricted to one place. That is why the colour combinations of friend planets were given.
My house entry is in the SSW and my 10th house has Sun, Mercury, Moon and Ketu with an exalted Venus; can I move the entry to the South-East?
If you open the South, open it in the good South pada (S4 as heard), and if you open the West, in the good West pada (W4 as heard). The present South-West entry should be corrected with door power.
Our small house has an iron door outside and a wooden door inside. Which is the main door, and what if the inner door is on a wrong pada?
The wooden door is the main door. Iron is acceptable in the West, and an iron door in the boundary wall is acceptable. If the inner main door is on an unfavourable pada, correct it with the direction-wise bandhanwars and symbols taught in this class plus some door power. Moving it to S4 suits only if the male head of the house has Kark, Makar or Kanya rashi, because Vedic vastu judges this from the male head of the house alone, not from anyone else such as the wife.