Take down your blinds and lay them flat in your backyard or lawn. Get a bucket of hot soapy water. ( If they are the white metal type, put a very small amount of bleach in it too).
Take a soft bristled floor brush and wash one side of them with this. Do the other side. Rinse, with the hottest water they will take- helps them to dry faster. Leave them outdoors for a while to dry - you won't get them completely dry - and hang them up again. Buy yourself something beautiful or useful with the money you've saved.