FIELD OF INVENTION The present invention relates to a selective organopolysiloxane antifoam composition /agent, its preparation and detergent formulations involving such selective organopolysiloxane antifoam composition/agent for use as fabric wash detergent adapted for excellent antifoaming effect in rinsing cycle while no defoaming effect in washing cycles. The present invention is thus directed to not only save huge amount of waste water but also help to preserve a massive amount precious clean water for desirable favourable use and application. Advantageously, therefore the present invention in other words is in the line of green water balance targeted to reduce pollution and save the world from future massive climatic disasters or ecological imbalances. BACKGROUND OF THE INVENTION Globally, many people clean fabrics by hand washing or machine-assisted hand washing with compositions containing soap and/or detergent. Machine-assisted hand washing of fabrics involves the use of a manual or semi-automatic wash machine with completion of the wash process by hand washing. In the normal washing process, water is taken in a bucket or in fabric's soaking container or washing tub of semi automatic machine. Thereafter, desired quantity of detergent is added to generate lather by hand shaking or run for a while the stirrer in semi-automatic machines. This is followed by immersion of the dirt fabrics for soaking for 15 to 20 min. After soaking period, the fabric is rubbed by hand to remove dirt or the washing cycle is run for 15 to 20 min in case of semi-automatic machines. For rinsing, the dirt water is drained out and by squeezing the dirt water is removed from fabrics. Thus each such rinsing cycle consists of squeezing the fabrics and washing the fabrics with fresh water. Such rinsing cycle is repeated for four to five times for hand wash or in case of semi automatic machine, four to five times rinse cycle is run to remove all foams before final spinning. 2 Effective hand wash detergent compositions comprise anionic surfactants, particularly alkylbenzene sulfonate and alkyl sulfate surfactants. It has also been found beneficial for the appearance and cleaning of cotton fabrics for hand wash laundry detergents to contain an amount of a cellulase enzyme sufficient to improve the appearance and cleaning of such fabrics, particularly after multiple cleaning cycles. But these anionic is important for cleaning and cheap source of generating substantial foam in the washing even at small amount. Globally, water pollution and water conservation are serious concerned specially in the developed and underdeveloped countries. In Asia, countries like India, China, Indonesia, Thailand, Vietnam more than 80% people wash their cloths by hand. In Latin America, countries like Brazil, Colombia, Venezuela, Argentina more than 70% people follow hand washing to clean their cloths. Hand washing of cleaning the cloths is also predominating in eastern Europe and Africans countries. During cleaning of fabrics by hand washing or by semiautomatic machine, huge amount of clean water is used during the rinsing where rinsed water contain ppm level of detergent. The ppm level of residual detergent doesn't make any discomfort during the use of washed garments/cloths in real life but it is a human way of mind to believe that generation of foam during rinsing means dirt detergent is still entrapped in the clothes and more washing is necessary. So, user continues rinsing till rinsing liquor free from foam by following a standard rinsing sequence by hand washing in an order of rinsing the fabrics first, followed by squeezing the fabrics and draining out the rinsed water and again following the same cycle. At the end of washing, it is estimated that an excess of 50% or more water is drained out as a waste water which not only generates huge amount of waste water but also is unnecessarily use up fresh water for such rinsing only due to foam generation. On the other hand, it is clear that we are not only draining out the water but also draining out a huge amount of money for waste water treatment and also spending money to generate fresh water. I^oreover, un-necessary use of valuable water for such hand washing/purposes is social evil in the country or region w.here scarcity of fresh water is massive. On the other hand , detergent used in hand washing / semiautomatic machine wash, must have good foaming in nature during the soaking and washing process. It is important due to the fact of traditional concept of no foam means not a good detergent. So, all detergent 3 manufacturers have a common requirement of foaming during washing and no foaming during rinsing that claims of saving cost and water of such l