If you decide to clean it. I suggest you put it on the frame with no legs. And clean the top with a medium brush, sweep and vac off. No water
Then put the legs under it and work on sides and ends. No water just dry brush and sweep, vac.
You probably have a mess inside too.
Next day rinse off, then go to work where you need to with whatever solution you decide on. Rinse everything you put on it well. Let dry direct sun ,repeat as needed. If it were me I would plan this has a two week project depending on how much time you have. Watch the weather.