Use Shampoo To Clean car but even shampoo can ruin paint thus just use it twice a month.
in routine clean car with wet soft cloth.if dust seen on car then wash car with plain water and then dry it using soft cloth
for paint job always try for Baked Paint
HJ motors rawalpindi(You can see it on the right side just after crossing under pass bridge while entering murree road) has one and charge you quite reasonably
For beautiful Lacquear finish(Shine) use TOYOTA CAPITAL MOTORS I-9 Islamabad