Clean Venetian blinds using a brush-head vacuum or soft cloth, towels, a sponge, and any mild multi-purpose detergent, such as dish soap. First, clean all dirt and dust from the blinds, then remove them to clean them with the detergent.
The best place to clean metal Venetian blinds is in the bathtub. After you remove loose dirt from the blinds with the cloth or vacuum, remove the blinds, place them in the tub, and clean them with the sponge and the detergent. Rinse the blinds thoroughly, and hang them up to dry before replacing them. The entire process takes less than half an hour.