Never use an abrasive material to clean your solar panels. Doing so could cause them to become scratched and less useful than they were when they were installed. Your best bet is to have a gentle cleanser and cloth on hand to clean your panels so that you know that you have what you need when the time comes.
You should always have a lease transfer option if you lease the solar energy system versus purchasing it outright. If your home is sold, you will need to have this option handy. If you can transfer it to the new owners, you'll be fine.
Cars that operate on solar power can cut down on carbon emissions a lot, but this system is not perfect yet. Having said that, small power machines that run on solar energy are available. Solar powered generators can be purchased, and are a great source of energy in emergencies.
Jonathan Rolande from https://housebuyfast.co.uk talks about installing solar panels and what affect this can have on your property value and saleability.