To clean rims and tires, just use the same car shampoo that you use for the car, then shine the tires using that tire polish you have bought.

You can try the method above by using car shampoo in a spray bottle and spraying it all over the tyres and rims and then brush the tyres and rims separately.

Or if you don't want to brush the tyres, MR DIY has a tyre cleaner for RM7 where you just live it on and rinse.

For stains can just try car polish liquid.

I hear that too much Polishing is not good.

But no Polish tyres may crack if always under sun...

So I am also interested in the proper car tyre care