wesay honest opinion.....Pehlay get the car 100% mechanically e.g
14 volts always at battery (costs more of your aqal than any time, costs = 50 rs ka sand paper, 100rs ki ground wire + thimbles)
suspension ball joints, cv joints and bushings in good order (genuine bushings and correct grease),
engine ignition system in top shape (if old car, then use a new distributor cap and check wires). (costs from 500 to 5000)
T stat valve and coolant
Check pcv valve
Replace brake oil and bleed. (using genuine pads) (costs 10k)
underbody rust control especially in wheel wells (costs 2-4k and your time)
if all the above is good, phir socho detailing ka 
