Are you sure it's only 303? I would just try re-applying 303 evenly. Read below:
"303 Protectant. 303 is a beautififying liquid sunscreen which will keep vinyl looking like new. 303 contains no petrochemicals, silicone oils or petroleum distillates. 303 is not a build-up product. 303 is not oily or greasy and does not attract dust. In fact, 303 treated vinyl repels dust, dirt and stains, stays cleaner longer and is much easier to clean when finally soiled. 303 is the most powerful UV screening treatment available for vinyl, leather, and rubber. Regular use of 303 can reduce UV caused slow-fade up to 100%."