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I suspect cheap paint due to the pinkish background areas that were not streaked or the house was not rinsed.  Major No No.  I would advise the owner that the house may have been a little dirtier than you had anticipated and that your solution had cleaned it more than you had expected.  Tell them that this is an anomaly and that you have cleaned lots of roofs and this has never happened.  Ask permission to clean an inconspicuous area. 

I would then use a 50/50 tile roof mix and wet the plants down but not the area that you are cleaning as that will weaken the mix too much and you MUST apply the mix to a dry area only.  Do not let it dry.  Rinse it off before it dries and see what it looks like the next day. 

I have seen this problem in the gutters after cleaning a tile roof.  Lots of streaks due to over spray.  I like my solution strong because time is money and I do not care to waste time cleaning an area 2 or more times when I could be cleaning another roof.  Cleaning the gutters with a 50/50 tile roof mix gets rid of it but I have always done it right away. 

That happened to me once when the house had varnished window shutters.  (Click on link) We always rinse with a 8 gal a minute pressure washer with a .30 dia roof cleaning tip.  For those that do not know, a 20% solution will lift varnish from shutters or wooden varnished doors.  Your answer to that is to keep lots of water on the varnished areas while you are cleaning the gutters or house. Good luck Yorkie!

Paint still scares the crap out of me, when I see a painted house, I am very timid. I like to zap the moss with a hot mix, and I have seen cheap pain be completely destroyed by SH. We run into a few painted cedar houses. Paint is tough because I don't know if its good, cheap so I try and stay away from them.

In south Florida 99.9% homes are painted I don`t know what the solution is fellas I`m guessing at the very least ground guy washing down at the same time as a lawn sprinkler washing down the same area??

Uncured paint is an issue, we ask, we put in writing and postpone jobs all the time because of recent paint of gutters, house, flashing. To be safe, paint needs several months to dry fully, we had the same thing with Sherman Williams paint, rep said no sh for 60-90 days. Spraying a roof and then spraying the house with the over spray on to the stained front door or painted surfaces can and will leave sh marks no matter how much rinse goes on prior ,during and after, the discoloration always seems to have that florescent green tint and on stained surfaces, doors, decks, those white speckles will cost you a new stained door re-finish.

We are working on soaking the surface prior and then spraying a "directional" away from the painted or stained surfaces. We cover front doors with plastic when necessary.