Tried various stuff in the past such as armorall, but the latest is Autoglym bumper care. Comes as a green gel and you just put in on a cloth and wipe over. As long as your tyres are clean to start with it lasts ages and each time you wash ther car the tyres come up well. Not a specific tyre cleaner but it does say it can be used on tyres....might actually try specific tyre cleaner made by Autoglym, or turtle wax as it sounds good