We have a black galaxy granite bench-top in our kitchen. My wife said it was looking dull and it was.
So I thought that some M5 cleaning stuff should do the trick.
1. Use spray and wipe and claybarred the entire surface
2. Wiped over with paper towel
3. Chamois all the surface
4. Applied Autoglym Resin polish and buffed off
5. Applied Auotglym high gloss resin sealer
And whoopee I have the glossiest bench top now!
Cheers
Dallas