You need to use a tire cleaner like McKee's 37 Tire and Rubber Rejuvenator. Spray it on, let it foam and turn brown, then scrub tire with a low profile tire brush. Rinse. I would do this at least twice or until the foam doesn't turn brown. Then apply your new water-based tire protectant. You can find those products at Autogeek.net.
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'09 6sp/Z1/PowerTrix/SPL/Swift/SRP/Whiteline/F.I.LTH&CBE/UpRev by Seb/CJM/Stillen/Ings+1/RJM/TrackSpec/Sparco/Motul/Wavetrac/Coolerworx/Verus/CraftSquare
'14 SRT Grand Cherokee; '08 TL Type-S
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