Star brite Instant Black Streak Remover&mdash Instantly removes black streaks caused by water run off. Safe for use on fiberglass, metal and painted surfaces. Just spray on, let work and hose off. Contains no harsh acids or alkalies. Cleans by patented process of chelation. Can be used for 1,000 of other tough cleaning jobs&ndash bathrooms, tubs, showers, etc. Gallon.