I know one thing that i will have to do later on and that is to do some research into the chemicals used to get the carpets clean after they have been stained, although some companies dont use chemicals - they boast that is is done with "green" methods, so i dont know exactly what is involved with this, wether it is 100% completely true or not i dont know, i know that most companies that do carpet cleaning use safe chemicals - because the ones that did my carpet told me so, so it must be true, and mine came out perfectly clean, (i was very pleased with the result) so this research may take a while, but i will make a list of all the chemicals used in carpet cleaning - and list exactly what they do.