303 Wiper Treatment Stops Annoying Chattering, Skipping and Streaking! 1.) By reconditioning hardening rubber blades. 303 Wiper Treatment restores lost flexibility and performance. 2.) 303 Wiper Treatment Keeps Wiper Blades Working Like New. Each 303 Wiper Treatment packet contains a sponge applicator. Wipe on, wait a minute and wipe dry. Nothing could be easier. Each packet will treat 2-3 wiper blades. Reapply as necessary, usually every 3-5 weeks. Each box contains 6 packets.