Best advice i can give you is to ignore alot of the panic mongers on here cause thats all they are. Have you ever cleaned a car before? Lol good chance its worth alot more than someones dirty carpet did you think oh no i best take a course before i attempt cleaning it? NO lmao after all its just a carpet and its very easy to clean one. If you listened to alot of the people on here you would think you were attempting brain surgery well you aint its just cleaning carpets. Im a new starter and though ive only spent a couple of grand on equipment i always do a good job i never leave a customers home thinking ive let them down if you have pride in your work even if it takes you a bit longer to do the job sometimes do your best and you should get it right. Give it a go mate if you really go for it you wont regret it.
what a stupid comparison, are you saying a car can shrink?
i can just see it now on the car cleaning forum, "help, ive just cleaned a peugeot 306 and over wet it and its now a peogeot 206, do you know a mechanic who can stratch it back into a 306, should i wait til its dry first"
different things clean differently, cleaning a million pound painting isn't rocket science but i certainly wouldn't use cilit bang and a duster. basic training is all we usually state on here, its the guys that aren't trained that exaggerate us and make out we think its rocket science, far from it but common sense says get some basic training.
enjoy the ncca course, it will tell you all you need to know to get started. as for mixing!!! theres no real need to mix, and if there is, it usually says so on the container what it can be mixed with. good luck.