No locality shall prohibit car washing as a noncommercial fundraising activity if the washing uses only biodegradable, phosphate-free, water-based cleaners, nor shall any permit issued pursuant to the State Water Control Law (§ 62.1-44.2 et seq.) prohibit the discharge of such noncommercial fundraising activity washwaters from a municipal separate storm sewer system.
Va. Code § 15.2-2114.1