What would be the best lubricant for the process of making table mould bricks?

In the process of making table mould bricks, after the sticky clay is filled into the mould, the mould is overturned, to release the clay in the shape of a brick. But, while it is dropped, because of ineffective lubrication on the inside walls of the mould, the resulting shape of the brick is unsatisfactory.





At the moment we are using soap powder as the lubricant, which is unsatisfactory.





It would be great if someone can let me know of a good alternative for this purpose. Thanks.What would be the best lubricant for the process of making table mould bricks?
Try vegetable oil.What would be the best lubricant for the process of making table mould bricks?
go to a masonry supply and ask for form oil...might work