QUOTE(kalvinkhoo @ Aug 4 2014, 02:32 PM)
Well i think the Meguair's Endurance Tyre Gel is not worth, for me is kinda expensive!
One of my all time favourite tire dressing. For RM58, if you apply every week (which you won't really need to cuz it'll last longer than that - provided you apply in on CLEAN rubber), for the average OEM tire wall size, you would finish that bottle in....errr....maybe 4 ~ 5 years time....

Expensive if you consider the initial investment but, in the long run, the cheapest tire shine around (even when it is a little bit overpriced locally if compared to how much it's selling in the US).
And about the clay thingy, if can afford, I would strongly suggest using a quick detailer instead of diluted shampoo, regardless which type/brand of clay. I have tried/used quite a few types/brands of clay ranging from the cheaper PG clay to Riccarro polyclay and all of them would have some sort of problem or another if used with diluted shampoo, ranging from crumbling and leaving clay residue to severe marring of the paint, and not to mention degrading more rapidly in storage after use. Another thing to also remember when using diluted shampoo as clay lubricant is that you'd NEED TO rinse (and sometime even wash again) the whole car down again afterwards. Whereas if using a quick detailer, you don't need to and whatever residue left are easily removed when you're doing the waxing/polishing afterwards. Worst comes to worst, if you don't plan to wax/polish after claying, another round of wiping with the same quick detailer could do the job.
Saying that, if you're just using a 'cheapo' clay then it doesn't really justify a dedicated clay lub which is few times more expensive the the clay itself. But just remember one thing though, claying *could* induce damages to the paint if the lubricant used is not....well...lubricative(?) enough and it would be more expensive and more time consuming correcting the paint when damaged.
My advice is, safest way is to read the label and use whatever that is recommended there. Just remember: prevention is FAR BETTER then correction.