getting rid of dirt on edge of plane texture

im making a 2d plattformer game in unity and im having truble with dirt on the edge of planes with alpha texture on them. is there a way to get rid of this by using choke or something simular

If the texture is not tiled, set it to Wrap Mode = Clamp.

If the texture tiles on the plane, then it will need to have 0 alpha on all the edge pixels, otherwise when it blends it will wrap the non-transparent part to the opposite edge.

In Unity 4.2.1f check Alpha is Transparency in Advance Texture Type

This option save my problem with edges (Work’s on android device)