It never ceases to amaze me how after 60 yrs or so grease mixed with a bit of dirt etc turns in to a form of sticky-hard-concrete that is only removable by scraping and scrubbing for hrs,i spent most of a hot 37 degree celsius saturday just cleaning the engine which wasnt disgusting but where acummulated heavy deposits had been left for decades refused to shift easily.
Same with g/box oil/grease had melted in to a sort of smooth/glazed layer on outside of casing.
john
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