Another trick that poses very little risk of transferring anything to the approach surface is to rub a soapstone stick on the slide sole of your shoe. It leaves virtually no visible residue or anything to transfer to the approach, and some bowling centers even keep it in stock at the front desk. Of course you don't want to go overboard with it, but simply rubbing the stick across the slide sole a couple of times will help out. If I'm braking too hard, I'll rub the leading edge of my braking heel with the stick, and it instantly softens up the brakes. The soapstone works its way into the slide sole and into the rubber of the heel.
In case you aren't familiar with soapstone sticks, they are commonly used for marking metal.....the stick is a somewhat soft solid, and you can find them in either rectangular shapes or cylindrical shapes. Your best bet to find some is a hardware store (some hardware stores will stock it for about 25 cents a stick), or you can find it at a location where they do metal working and welding.
