Solar output in California changes for many reasons, and cleaning only helps when soiling is actually blocking light on the panels. Use a clear-day monitoring check and a quick visual inspection from the ground to decide whether you need professional solar panel cleaning or a solar system inspection instead.

This checklist breaks down 11 common exterior cleaning mistakes that lead to streaks, damage, and stains that keep coming back. It explains why each mistake happens, what to do instead, and how small choices like pressure, timing, and stain identification can protect your home’s surfaces and save you from repeat work.

Spring is the best time to reset your home’s exterior because mild weather helps cleaning work better and it clears winter grime before outdoor season. A professional approach combines the right washing method for each surface with detailed window, screen, and solar cleaning for the biggest curb appeal upgrade without damage.

Condensation or fogging between window panes usually means the seal on a double-pane insulated glass unit has failed, allowing moisture into the space where it can’t be cleaned from either side.