Most used fining agent for wine is

Solution (By Examveda Team)

The most used fining agent for wine is Bentonite clay.
Bentonite clay is the most widely used fining agent against heat-instable grape proteins in white wines. As it is negatively charged and dense when it does bond with a positively charged particle they both sink to the bottom of your carboy.
It is a common additive used to clarify fine wines. It's great for removing protein haze and can be used to remove aromas.