How to shine plastic?!

I have tried plastic renew, but have found that mop n' glow works just as good and is cheaper. I have done the process where you wet send with progressively finer sand paper, buff with steel wool, then mop n' glow on various projects and it makes the plastics look like new. Just make sure you take your time with the sanding, though.
 
I use pledge furniture polish, spay it on and wipe off works great also repells mud and water plus its cheap
 
polishing compound and a buffer is the best way. any automotive wheel cleaner. spray wax works wonders as well. turtle wax ice and lucas slick mist are my fav's.
 
If ure scratches are that deep take a heat gun to it. Blow dryer would work but I used a heat gun and it melted all the scratches back in place then made them shiny. I was surprised by how good it came out