Whats the best stuff to give an old wetsuit a bit of a shine??
Turtle Wax 
Several companies make wetsuit shampoo (though I just use antibacterial bath soap…never had any problems in 20 years of doing this). In extra funky situations, use an enzymatic cleaner and soak the wetsuit in a tub.
Some products:
MiraZyme: http://www.become.com/enzyme-wetsuit?&qet
Wetsuit Shampoo: http://www.become.com/wetsuit-shampoo?&qet
http://www.ebodyboarding.com/acess/Repair-Cleaning/Wetsuit-Shampoo
Enter code “Slowtwitch” in the coupon code field during checkout for a discount!