popped down to my mates to have my pilot race tyres fitted today. when i asked about scrubbing in ?. p.o.p! to take the slippy shiney stuff off,just spray on brake/clutch cleaner on the tyre & rub with a rag.. i found it worked a treat.
I've always been told it takes more than that. For the first few miles there are still "mould" release agents coming out of the surface of the rubber.
I know people who have used emery cloth, a paddock stand and had the bike in gear while they emery cloth the tyre. Still slippy until it's done some miles on the road.