Accumulation of dirt, dust particles and/or other debris on the paint film; may resemble mildew.

Possible cause

  • Use of low quality paint
  • Soil splashing onto the substrate
  • Air pollution, car exhaust and flying dust collecting on house body and horizontal trim

 

Solution

Wash off all surface dirt before priming and painting. If unsure whether the problem is dirt or mildew, conduct a simple spot-test (see Mould).

Clean off dirt with a scrub brush and detergent solution, followed by a thorough rinsing with a garden hose. Heavier dirt accumulations may require the use of a power washer.

While dirt pickup can't be eliminated entirely, top quality exterior latex paints typically offer superior dirt pickup resistance and washability. Also, higher gloss paints are more resistant to dirt pickup than flat paints, which are more porous and can more easily entrap dirt. Dulux recommends the use of Dulux Weathershield® Gloss for exterior surfaces.


More problem solving advice

When droplets appear on acrylic paint

Have you noticed small droplets appearing on your fresh coat of acrylic paint? Don't panic – it’s a normal part of the curing process. Find out more.

Yellowing

Yellowing describes the development of a yellow cast in aging paint solvent-based enamels. Find out more.

Wrinkling

Wrinkling is a term used to describe a rough, crinkled paint surface occurring when paint forms a 'skin'. Find out more.

Tannin staining

Tannin staining is the brownish or tan discoloration on the paint surface due to migration of tannins from the substrate through the paint film. Find out more.