I guess your in wonderland,sweet dreams,I didn't think powerwashers needed any sleep.
I had rather call acid "aluinum'brighter",it sounds more pro,I use a HF and PH aluminum'brighter.The HF cann't be used on polished or stainless steel unless you really know what your doing,even pro's screwup at times.The PH can be used on polished,stainless steel,about anything ect.stuff.
Cann't tell you all the glass the HF well hurt b/c I haven't tried it on all glass,it will hurt the windsheilds but not the other glass on trucks.I do 2-step houses but I try not to get any on the windows,which I have but no harm,not telling you to.
I apply the aluminum'brighter with a downstreamer,everybody else around here upstreams it.They also have to replace the coils once a year b/c it will eats its way though and usually rebuild their pumps onces a year,I never do.The cat pump is the only one that will hold up for a year if upstreaming HF..dat I know of.
As for as dwell time by the time you get it applied you can start washing where you fisrt started appling it.I wash alot of trucks and things which I 2-step most everything,I haven't picked up a brush in a long time as to brush paint,I do brush the stacks and some rims.
I have a house to wash next week which has brick,stone and vin'le siding,I will 2-step all of it.I never use bleach or ivory or dawn or other stuff,guess the aluminum'brighter kills the mi'dew b/c it doesn't come back for a year or so.
I use a double lance to work the downstreamer and I upstream the soap,my downstreamer orifice size is 2.3mm nonajustable,,,my wand tips are 2030 and 4008,yeah I wash with a 40 degree,sometimes I'll use a 1040 and 25 7.5,,