Don't be so fowl Wynne!
I wouldn't have bothered too much with the scrubbing bit on that grease. After a liberal dose of HOT powerburst with plenty of oxidiser in it, I'd have maybe run the rotary with poly brush over it
Then RX-20 with the TM, something in the chem feed like SPM I've been using lately... bob's your uncle!
But these are yukky jobs, not my favourite!