I do not bother cleaning the inside of the donuts, these were installed to protect the sprinkler heads from lawn tractors. As far as i can see any grass that grows in the inside area does NOT impact the operation of the sprinkler head, so why bother. I have not cleaned ours since they were put in 10 years ago. I do replace broken donuts, and the occasional broken sprinkler.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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