Wesley's Bleach White will work,but a word of caution.......keep the spray to a minimum around painted surfaces(avoid too much overspray on the wheels) and rinse it off of paint and wheels immediately.I bought some BF goodriches last year and now the white lettering is turning brown from the top of the lettering. I scrubbed the heck out of them but nothing. Any suggestions.
Give BFG a call or e-mail them with your issue. Mybe it is something they know about or they can help.The car is garage kept and not driven frequently so the sun theory wouldn't work. I don't have aluminum wheels so I should be OK there.
It's just weird to me that tires a year old and maybe have 60 miles in them that the white lettering is turning brown on all four tires from the top of the lettering. I am wondering if it is some kind of defect. I'll give the Wesley's/SOS/Simple Green/WD-40 solutions a try.
Start with the SOS pads ... It's old school and works and it's easy to get close to the rim of the wheel without getting the rim itself. Keep the pad wet and replace it if you run out of soap.