You'd be surprised how much the water quality can change, even 100m down the road.

My bore water is drinking quality, yet 100m away in the new estate behind my place, all the houses are getting stained brown from the rusty bore water.

It can sometimes be blamed on the pipes leaving hard deposits, depending on what they are made out of and how old they are.

I think I've done it again.
Went out and bought the first Meguiars wheel cleaner I found, "Non Acid Wheel Cleaner".
I just checked out their website and am now worried that maybe I should have got the Hot Rims All Wheel Cleaner.

Does anyone know if the Non Acid Wheel Cleaner is suitable for stock MY03 WRX wheels?

ps I haven't used it yet.

Of course the Meg's stuff will be fine

Far better than the other crap out there! Stick to Meguiars stuff when cleaning cars. great BFYB.

While you should never use one of those cheap sponges on paintwork, they are great for wheels. IMHO you never clean the wheels with same sponge / hand mitten that you use for your paintwork!