Better late than never on this info! Low PH on browning pieces. " WE" do all know that PH 7 is neutral !? Anything lower is acidic and anything higher is alkalinity . Your alkalinity is your workhorse, "detergents" and every # over 7 your pH strength gets stronger. Say a 12pH is some really kick ass detergents, you can cause more problems with higher pH's, such as color loss! " Low pH on wools, follow up with a fiber rinse which would be acidic."
Clean with only high enough pH "alkalinity" to clean fibers, follow with a low pH "acidic" to rinse fibers.
If you think you have upholstery's or carpets "usually wool or rug fringes, raw cottons" that will brown, use an acid rinse and speed dry will help eliminate allot of browning problems. Plus an acid rinse will also leave a "soft hand" .
Leaving high pH's in carpet or upholstery's causes them to dirty quicker because the detergents left in can be "sticky". Always try to leave them in a slightly acidic state.
Check for colorfastnest in inconspicuous areas with your detergents . These methods are more for HWE, although this chemistry can be applied to all wet cleanables.
An upholstery class is a very good thing to take, there is alot of upholstery's you can wet clean with the right knowledge . On an average I Charge $10 a liner foot for sofas, 7' = $70. You can do wet cleaning with small porty's , you don't need a 35 hp truckmount, and this is another niche in your cleaning biz that can help fill in some empty slots in your work schedule.
I did take a Jon don upholstery and fabric class and I do recommend taking one if you plan to do much of this type of cleaning, Theres money in this stuff and it is just as easy as cleaning carpets with the right knowledge.
