The Meguiar's tire foam does a good job for this. Since most all of the tire treatments do and should wash out under rain or damp conditions you really don't want to overpay. Michelin also had a good over the counter product until it was discontinued. If you must go mail order buy in bulk...
www.chemicalguys.com sell to professional detailers. I'd give them a ring and see what they recommend. I put very little weight in brand names when it comes to detailing products. The No frills stuff like chemicalguys is used on high end cars and their clients keep coming back.
all of these water-based tire treatments don't last long thus you end up using a lot of product over the course of year unless its a garage queen.
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