Hi,
I have taken services from 3M car care at Borivali and found them to be exceptionally professional.
They do the job well and what extra money they charge compared to road side guys, is totally worth it.
I have taken the yearly AMC contract of which used two coupons so far and was totally satisfied.
As for the anti-microbes treatment, although I opted for it, do not know how god or bad it is. So can not confirm its effectiveness. However, as for the car care as a whole, go for it.