It is impossible to visually distinguish good and bad powder detergent. Good detergent depends on content of active matter (AM) in the formula which is often clearly printed on package. High AM helps to fight tough stains and dirt more easily.
Besides, there are some micro agents and bioactive matters in good dertegent help to remove oil, grease and sweat which are not included in every kind of detergent like SCMC and polimer - additives to synthetic detergent powders to eliminate the redeposition problem on clothes.
So, consumers can rely on their experience and prestigious products to select suitable powder detergent.