Green Goo C2

Hi guys.

I came across the dreaded green goo yesterday on a domestic EICR in a rental. I have coded it as a C2. I believe that is correct from what i have read on-line re can cause over heating if it causes an arc at the terminals.  I have also said the general guidance is to rewire although it may be able to be cleaned off and monitored with regular inspections. Any thoughts please.

I know this has been discussed many times on here but couldn't get anything up on a search.  Cheers