GE gas range with sealed burners.

The front burners appear to have gotten clogged. Gas no longer flows
freely though the stem. Gas also leaks a bit under the cover. I opened
the cover and found a lot of cleaner residue around the burner assembly.
I am guessing the tenant clogged it up over time by getting cleaners
into the burner assembly itself. I think the gas is backing up though
the air intake that mixes the gas with air before its ignited. I
checked out the gas control valves and they seem to work fine.

Question: Is a burner assembly something that can be cleaned? Or do
you just replace it?

Thanks in advance..

Matt