This texture is FREE for personal and commercial use!
It can be downloaded at
https://www.texturecan.com/details/222/
This texture is an imperfection. It is glass stain. When a glass of cold drink is put on a cloth, it will leave a water stain.
There are 6 variations which should be enough for scattering randomness.
This is a seamless and tileable PBR CG texture for 3D artists.
Each package usually includes a Base Color Map / Diffuse Map, Normal Map, Roughness Map, Displacement Map, Metallic Map (Metals Only) and Ambient Occlusion Map.
The texture maps are applicable to Blender, ZBrush, Sketchup, Maya, 3D Max, Cinema 4D, Unity, Unreal etc.