How to maintain the Auris properly?

Hi, how can I take care of my Auris properly? So wash with what means (a recommendation would be good, thought of the natural products of Frog!) Then after the laundry with what stuff and especially how properly grown? Clean the plastic and with what? Do you also get these white stripes/craters from the plastic? There is not much in the operating instructions, but you should wash the car from below… Only how if it is not to be in the washing system if possible? Which places do I have to pay particular attention to? How do I care for the sealing rubbers? Usw…. Thank you. MfG St3v3