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Ambient Streaks – Draws streaks across the dirt effect, respective to the ambient occlusion.

Inner Streaks – Draws streaks across the dirt effect respective to the inner occlusion.

Streaks Blur – When enabled, blurs the dirt streaks. Bear in mind that a new algorithm is calculating this effect, and the visual representation of the streaks is different.

Streaks Size – Controls the thickness of all streaks.

Streaks Density – Controls the density of the streaks.

Blur – Controls the amount of the blur of the streaks.

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Thin Mode – When enabled, VRayDirt enhances the look of thin surfaces by casting less dirt on them. It is available only for the Inner Occlusion mode. 

Ignore for GI – When enabled, the dirt effect is ignored in GI calculations. 

Ignore Bump – When enabled, bump maps are excluded from VRayDirt computations. The option is useful when the bump effect is too strong and may produce undesirable effects such as holes.

Consider Same Object Only – When enabled, the dirt affects only the objects themselves, without including contact surfaces and edges. If offIf this option is disabled, the entire scene geometry is participating for in the final result.

Invert Normal –

Affect Alpha –

Double Sided – When enabled, rays will be are traced both in the direction of the normal and in the opposite direction. This creates an effect where both crevices and edges are occluded. 

Work with Transparency Ignore Invisible Objects – When enabled, VRayDirt takes into account the opacity of the occluding objects. This can be used, for example, if you want to calculate ambient occlusion from opacity-mapped trees, etc. When disabled (by the default), occluding objects are always assumed to be opaque. Note that working with correct opacity is slower , since, in that case, VRayDirt must examine and evaluate the material on the occluding objects.

Ignore Self Occlusion –

Mode – Specifies the mode in which the dirt map is going to be calculated.

Ambient occlusion – Normal ambient occlusion is calculated.
Reflection occlusion (Phong, Blinn, Ward)  – Reflection occlusion is used. The difference between ambient and reflection occlusion is basically in the direction in which rays are traced. With ambient occlusion rays are traced in all directions uniformly while with reflection occlusion the direction depends on the viewing direction (just as when calculating reflections) and the spread of the rays depends on the Reflection glossiness and BRDF type used.
Inner occlusion – Allows the user to invert the effect with respect to surface normals - e.g. instead of crevices, open corners are shaded with the occluded color. This mode changes the direction of tracing the rays. When this mode is selected, the rays are traced inside the surface, otherwise, they are traced outside the surface. 
Ambient + inner occlusion – A combination of Ambient occlusion and Inner occlusion modes used for enhanced weathering effect.

When enabled, the object does not occlude itself. It is occluded only by other objects in the scene.

Environment Occlusion – When enabled, VRayDirt includes environment contribution to the shading of unoccluded areas.

Affect Reflection Elements – When enabled, the ambient reflection affects the reflection Reflection render elements. This can be used to create a reflection mask.

Glossiness – Controls the spread of the rays traced for Reflection Occlusion. A value of 1 means that just a single ray is traced (just like when tracing clear reflections), ; smaller values cause multiple rays to be traced in the approximate reflection direction. A Texture can be applied and blended with the value using the Mix Strength option.

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Include/Exclude – Allows you to disable/enable the calculation of the VRayDirt map the VRayDirt map for specific objects. Excluded object will objects are not be shaded by the VRayDirt map.

As Inclusive List –

Use Texture for Excluded –

shaded by the VRayDirt map. When an object is added to the list, the Image Added icon appears next to it. This determines whether the object's children are also considered. It is disabled by default. 

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Affected By Result Affect – Specifies a list of objects which affect that are included in the calculation of the VRayDirt mapthe VRayDirt map. Excluded objects are considered "invisible" for the calculations of the VRayDirt map.

As Inclusive List –

Subdivs as Samples –

Screen Space Radius –

Streaks Ambient – Draws streaks across dirt effect respective to ambient occlusion.

Streaks Inner – Draws streaks across dirt effect respective to inner occlusion.

StreaksSize – Controls the thickness of all streaks.the VRayDirt map - they don't produce the effect over other objects. When an object is added to the list, the Image Added icon appears next to it. This determines whether the object's children are also considered. It is disabled by default.