Voltaic solar panels are remarkably tough. Voltaic solar panels consist of three layers: 1) an aluminum/plastic/aluminum substrate that gives the panel an excellent strength to weight ratio, 2) the monocrystalline cells and 3) a scratch- and UV-resistant and self-healing coating. This means they'll stand up to all kinds of abuse.
To clean, simply take a damp cloth and wipe away any surface dirt. If extra dirty, we use isopropyl alchohol or some soapy water as well.
The sun on a hot day or a hair dryer will also melt away any minor scratches on our urethane panels.