so i managed to clean it up a bit, lots of scrubbing and using some magic Bintel lollie water
for the optics and some orange power cleaner for the tube and dew shield. its come up a treat
the amount of crud on the lens was incredible, the magic water from bintel is amazing, it is indeed divine intervention as they come up sparkly and new.
The scope has had a hard life, lots of salt air apparently, then years of being in a shed where it was not loved up the hunter valley and the drought dust was thick. So i vacuumed out the case where there was a heap of red dust and replaced the screw that held a finder bracket on the scope, it was pushing on the focuser and has marked it over the time the last owner used it, so i put on a new finder bracket. the focuser works very smoothly now, no impairments.
The next thing i need is some batteries for the finderscope reticle.