I just spent more than 3 hours cleaning my blinds. I'm sure I didn't get all of it since one of the 3 sets is behind a table and I can't reach the top part, but I'm too tired to care right now.
My blinds are the standard aluminum ones, so I had to be pretty slow when I was wiping them.
Ungh, they're white so, yeah, the amount of buildup actually shows up when you're looking carefully. I didn't really notice since you can't really notice the white blinds darkening... geez.
So, remember to dust off your blinds even if they look clean, simple dust sweep can help you avoid loads of trouble later =/.
Hopefully this will help my allergies. If that's what is causing it anyway.