A clean blinds makes a bigger difference than you'd think. Here's the most effective method, plus the mistakes most people make.
Close the blinds flat and wipe each slat from left to right with a microfiber cloth. Reverse the blinds and repeat on the other side.
Wrap microfiber cloths around tongs and secure with rubber bands. Clamp each slat and slide across -- cleans both sides simultaneously.
Spray Vibes Multi-Surface Cleaner on a cloth and wipe stubborn spots on each slat. Don't spray directly on blinds to avoid dripping.
For aluminum or vinyl blinds, remove them and soak in a bathtub of warm soapy water for 30 minutes. Wipe clean, rinse, and rehang.