Character's vision, vehicle's windshield, etc. can stain and obscure vision. Either temporarily, until cleaned or even permanently.
Alternate names: View staining, Windshield staining
The first video game about Screen staining was released on August 18, 2009.
This also covers other bits that obscure vision that are not really stains, such as cracked windshield.
Distorted vision, Staining
compare with these groups