There are various easy ways to clean your net curtains:-
– put in the washing machine on a normal 40C wash, with a powder like Persil Automatic, add some additional white items (like white towel, polo shirt, bath mat) – this bulks out the wash to help with agitation. Spin dry and either put on radiator or hang on washing line. Nets can be put back at windows slightly damp.
– if you don’t want to wash in the washing machine you could soak in a sink of hot water with baking soda, then wash, wring out by hand and hang on line until damp/dry.
– a tip from the 70s is to put your nets in a bath with a sterident tablet, then wash as normal (either by hand or machine), and dry before putting back at windows.
http://www.homestarcleaning.co.uk/