Bobby Kinstle

Mine turn black pretty fast and after a few washes I noticed they are getting rough and in need of some good polishing.

AForePlayin'03

I used this product called Mothers Aluminum Polish on my A4 tips for years. I liked it a lot:

GUEST123

After shining lots of "brightwork" in the Navy many years ago, I've found NEVR-DULL to be perfect for my exhaust tips. I wear disposable nitrile gloves when using it so I don't end up with black polishing residue on my hands/fingers.

rocknS4

Ditto on the NEVR-DULL works very well.

DrGP

SOS/Brillo pad works well for me.

519PMP

To help maintain them in between polishes, at each wash I use Chemical Guys All Clean and an old toothbrush.

kczach

Barkeepers Friend works pretty good.

texasDFWS4

+1

NWS4Guy

Collinite No. 850. It's a very fine grit metal polish and wax all in one. Very inexpensive, goes on then right off before it dries, and leaves a wax on the metal that allows a quick wipe with a cloth for months later to remove 99% of any exhaust residue. My polished APR tips look brand new with no scratches using this for years.

Bobby Kinstle

The heat doesn't mess up the wax?