In layman's terms, that soreness you feel after a workout is a pretty good indicator that your muscle fibers are getting stronger and more efficient so that the next time you ask them to do the same workout, they'll be better prepared for the stress.
There's no easy fix
The cliche of "no pain, no gain" is, sadly, mostly true when it comes to working out. While there are ways to limit and reduce the pain associated with DOMS, there's no quick fix to make it simply go away. If you want to see steady improvements in the gym, you're going to have to resign yourself to the occasional discomfort of DOMS. Sorry.
That said, the treatments that appear to do the most good are those that encourage blood flow to the worked muscle, helping deliver key nutrients to the damaged tissue while removing waste products from the area.