Hi Austin and all. A few questions for your advice and tips on cleaning different types of surfaces (see also photos attached): 1. I got lines when cleaning concrete. Understand that using prewash with chemicals should do the job better, but 1) I can’t use chemicals to be drained in the waters - need to get permission from council apparently…. But 2) don’t want to add more equipment and things to think about/fit in the car at the beginning 2. Is there a better way / solution to tackle these small, dark spots? See second photo and they still remained after the surface cleaner pass 3. Wonder if there is a list of what types of floor we can wash with the pressure washer? On the third photo I have this kind of tiles… can I wash it with water under pressure or it might break?