@ ahmed
yaar that was Mr hassan ,who converted to power steering . i personaly talk to him he welcome if u wana try the drive of the car.
secondly yaar yes you r right engine wash keeps the car smooth , i personaly hve observed it. i own a santro and i wash her engine everyweeks by mself. if u keep the presure low , there isnt any harm to sensors. also there is specific part on which they dont recommend water other wise engine bay ko and kangiee ko and baki machenical parts ko saaf karain and deisl maraain , keep the bay clean , air filter ko saaf karain hawa say and it will give u smooth drive .