If it is a new container of the product, contact the supplier. If the package is being reopened, and a small amount of free water is present, then remove the water with a clean paper towel or similar absorbent material and dispose of it properly. Gross contamination with water may render the grease unsuitable for use. Small amounts of particulate matter (dirt/dust) can be removed from the grease surface with a clean spatula or putty knife and the removed material disposed of properly. It may be necessary to remove the entire top layer of the grease. For this reason, it is important to keep the lid securely on partially used containers of grease.