Can’t beat elbow grease. When I was in high school I always used a Brillo pad first and then used a small stiff bristled hand brush with a few drops of mom’s dishwashing soap and a dose of Comet powder. The whitewalls always turned out really white.
Chuck 1950 Chevy 1/2 ton (all original) 1951 Chevy 1/2 ton (future streetrod) 1941 Chevy coupe 1938 Chevy coupe streetrod