Talks about clay bar, it cost slightly above rm100, can get from Ace Hardware.
I didn't have it, too expensive.
I did let the car wash centre tried (clay bar cleanning) once on my car, just a small area on the rear boot.
The effect of cleanning off all those sticky dirt is damn great. After wash but before clay cleaning, the surface is a bit rough, can feel by hand, eventhough i have polish & wax it few weeks ago. Then after clay bar cleaning, the surface is damn smooth! And can see the dirt sticked on the clay bar. Those dirt cant be clean off by car wash, will stick to clay bar.
Application of clay bar:
Use after car wash, but before polish & wax. 1st: "mixed" it like mixing plastersin(for 2nd time usage & above), to hide those dirty things inside the clay, then spray water to the clay bar & the car surface, then rub the clay bar on the surface (straight, not circular), repeat "mixed it" several time after clean-up a small section, clean section by section.
After clay bar cleanning, wipe dry & can start polish & wax again.