Dust and mould on fly-wire screens can be a real problem for people with asthma and other allergies, especially on windows and doors located on the shaded side of the house.
For screens that can’t be taken down, you can use a vacuum cleaner to suck away dust, sticky spider webs, insects and mould spores.
For screens that can be removed, take them outside and use a hand brush to remove all the loose material, making sure that the wind carries the dust away from you. It is very important, in terms of the quality of the air you breathe indoors, that screens are clear of dust and mould spores.
To wash screens, use very hot water and vinegar (1 cup of vinegar to half bucket of hot water). Give a final wipe-over with pure vinegar on another soft cloth. The vinegar will act as an anti-mould agent. If the mould is particularly bad, add a few drops of tea tree oil to hot water for your final wipe-over — to kill mould spores.
One final hint: dry the screens in a sunny place where there is a breeze blowing.