Use a product called 'Oil Flo'. Wipe it on and wipe off the silicon.
It's available through ABC.
Nick's Window Cleaning
Jim Andrews wrote:
We have a big job coming up at the
end of the week with glass that is covered in silicone. What is the
process using baby powder and steel wool? Do you sprinkle powder on
dry wool and then rub off? We've always used steel wool but have never
added the baby powder but thought we might try it on this job.