Armorall Extreme Tire Shine.
 

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An alternative to the popular tire foam is this little product from armorall. This stuff is very oily and almost resembles baby oil. Instructions say to spray on the tires but that is a mistake, if this stuff drips down on your rims (and it does run) it will smear all over your rims causing them to look terrible. A perfect solution is to simply spray the cleaner on a brush and then use that on your tires. The ending results is a nice deep black shine that seems to stay on the tire for a fair amount of time. IMO this product is easier and quicker to apply then most tire foams. Simply reapply this stuff once a week and you will have nice black tires for a long time to come. This is one of the few products from armorall to receive my approval.

Here is a pic kind of showing the change in color tone. The inside of the tire was left untouch while the outer part of the thread along with the face if the tire has a coat of the tire shine. Sorry about the shadow, forgot the sun was behind me. :o

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it's a light weight silicone most of the ones people say work well are heavy weight