Firstly you start with a 20lt / 5 gallon bucket or drum. I fill 30% with SH (sodium hypocloride ) and top up with water and than i ad about 200ml of surfactant to help the mix foam up and stick to the house.
Now this mix is not always set in stone as if its a really dirty house i mite put 35% or 40% SH so you can play with the percentage of SH you put in, Unless your experienced i would not put any more than 40% in, Best to wash the house twice than damage anything.
Below ill link a you tube video that you should watch as well.
Now this mix is what i use every day for your standard houses, If you have to clean oil or oil based mess that don't use SH use a mineral based de-greaser in the same ratio and that should do the job.
Also not guys the SH i use is 12.5% so its strong if you use cheap 10% or 8% you may want to up your percentage to 40% to get the same results.
Any questions just ask guys
Troy Hillard
Wash Rite NZ