Guys I need your advice on my Liana's general service. Since I bought the car, I have been taking out dust from all nooks and corners and now that it is super clean from all corners and under the seats, I have discovered yesterday that a thick layer of dust is under the floor carpets. A friend of mine has advised me to go for general service but I am hesitating because as per him, the general service guys will pump pressurized water into the holes of the floor and it will "push out" all the mud and dirt from the inside. But isn't that going to rust my car's floor? For now, I have checked under the thick layer of hardened dust under the carpet and the paint is fully intact and metal is solid. No signs of rust anywhere. Please advice me on this. I want to keep my car completely free from rust but also want to clean it thoroughly.