Rock climbers love that incredible stickiness from a brand new pair of rock shoes.  But when dust, chalk, grime etc. get slowly ground into the rubber, it seems like you never quite get back the “grip-tion” of new shoes. 

Well, you can, or at least get pretty close. Wipe down your shoe rubber some rubbing alcohol. Do this outside, as the fumes can be strong. A rag works better than paper towels.

Some gentle buffing with 80 grit sandpaper or a wire brush can help rough up the surface and make your shoes a bit stickier as well. Give it a try before your next hard boulder problem or red point attempt; every little bit of grip helps!