trrouble is
It forces water in where water shouldnt be, like inside the wheel rims and then because the wheel rims are all alloy, will start to corrode from the inside out, normally causing the tyres to go down sooner cos there is corrosion between the rim and bead of the tyre.
I do agree that when using the hot washer for certain jobs it does bring it up sparkly clean, but that normally means the heat has washed away all the grease and dirt, and left the whole bike open to external corrosion unless you re-apply some form of anti corrosion stuff.
A simple sponge and some decent(why use cheap) car shampoo will clean and put a microscopic coating of wax over it,then lots of elbow grease to clean and polish afterwards.
The wash is only the first stage for me, its then blown dry with compressed air, then around 6 hours of cleaning ensue.
I use old toothbrushes dipped in liquid wd40 to clean stuff that you normally cant get to, also go to the shops and buy several dishwashing,bog cleaning,and bottle brushes too, to use in the wash stage.
you cant beat elbow grease, and its free.