My professional approach to cleaning Astro Turf is as follows.

Stage one; Clear as much loose dirt and leaf mater with a power broom.

Stage two; Carefully wash the affected area until all the dirt and grime build up has gone.

Stage three; Treat with the correct product, depending on customer needs and environmental concerns. 

Stage four; resand the turf if needed.

Your Astro turf is ready to use. Look, The years have rolled back...