Thanks for the great info guys. Keep it coming.
I'm thinking a progressive set of steps:
1) Soak for
TBD days in Simple Green
2) Scrubbing with a stiff brush and Simple Green or a similar citrus based degreaser/cleaner.
3) Hot water scrub to remove residues
4) Repeat steps 1 to 3 as necessary
5) Apply and work in one of the petroleum/
oil based products mentioned in previous posts
6) Dependent on surface "shine" achieved/desired, apply a tire/rubber protectant.
Cheers
Greg