What actually happens is that the damage comes from the paint lacquer contracting upon cooling and moulding to the uneven texture of the hardened deposit.

When paint lacquer warms, it becomes softer and it expands. The heat also dries and hardens any bird droppings on the surface. Autoglym's researchers found that when lacquer paint cools, it contracts, hardens and moulds that surround the texture of the bird dropping. 

The moulding, when viewed at a microscopic level, looks like dulled or etched paintwork. The reflection is disrupted by the unevenness of the surface. This is not like the undamaged paint around it that provides a clearer reflection.

Autoglym conducted tests on it, from the water being strongly acidic, neutral and strongly alkali. However, the bird dropping substitutes emphasized the negligible differences in the damage that came about as a result. Autoglym also noted that there were differences in paint damage when the substitute bird deposits had varying degrees of grain-to-liquid content. 

Its texture is grainier due to light distortion (dullness) when the paint moulded around it. For limited production, the owner can make use of xax and polish treatments (which protect against chemical attack from acid raid and UV sun damage. For instance, it example a limited protection from the paint moulding to bird droppings, They also appear easier to remove.
source : 4wheelsnews.com

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