Astoria Instructional: Cleaning 

Hello, I just come to buy an older model 2 group astoria. on occasion older models are compatible with the backflush?

How can i control flush water ?

Shall i do the backflash cleaning with a blind filter on a Astoria lever machine?

If anyone can help..... What is the recommended frothing wand cleaning with detergent? I've seen a video saying don't soak in water. Just cycle and rinse. Thank You.