Rust under the spray nozzles

Hello, guys!
I just wanted to give you a little tip before the bonnet rusts off! I blew my spray nozzles with pressurized air yesterday because they were totally clogged. Here I have noticed that under the rubbers, which regulate the water inflow, comrade "Rost" has mercilessly spread.

I'll have to get rid of that as soon as possible! It is not a supporting part :-)) but nevertheless !
Has anyone noticed this from you?

Greetings, Matthias