I can't remember what I use. There is a very limited choice here. I think I use Armor All or something. All I remember is it comes in a spray can and foams up. It works good. THis reminds me that I need to wash the bug.
Normally I use NO TOUCH WET n' Protect. But now that all of you are saying that the meguiars tire gel is good, I will have to try it. I sell a whole crap load of different products, Mothers, Meguiars, No Touch, Armorall, Turtle wax, but i have found that the NO TOUCH works the best. I used to use Tire Foam by no touch but it attracted to much dust and crap.
Zaino also makes a nice tire cleaner/shine product.
I had a bottle of stuff in the garage, that I used every so often. It strips all the tire shine stuff off the tires, deep cleans and replaces the chemicals that leaches out of the rubber over time, that turn them a dull gray/black. It's not a shine product, but a cleaner rejuvenator. The problem is, I ran out of it a year or so ago, and didn't keep the container... now I can't remember what it was called.
I use Meguire's, The purple high-gloss gel stuff. It works great as I'm sure you know. If you want to get some more of it I strongly suggest going to car shows. Every car show I go to has a Meguire's booth. they've had it every time, and now I can't find it in stores so that is where I get it. I believe it is still on the website, which means it is not discontinued. I really hope this helps, and if you find it at a car show I strongly suggest you stock up!