jimbo74

this isn't as clean as I want it, and not sure where to proceed from here

I have already used foaming engine degreaser on it, and given it a pretty liberal 1600 psi pressure washing

akdoggie

3m roloc's work wonders with a drill or air grinder

white89gt

AK is dead on..... those things are awesome!

JCR 56

Just keep moving and don't stay in one place too long.

DarrinT04

agree. doing that can lead to more trouble than you have now

white89gt

It's pretty much a Scotch Brite pad. You would have to hold it there for a really long time to cut into it.

akdoggie

The courser ones will destroy aluminum w a small grinder. 180 or 240 w aluminum.

kd4gij

What they said plus I use these also.
https://www.harborfreight.com/heavy-...-pc-69601.html

DarrinT04

those work fine as long as you don't use a hammer with it

Jbrew

You could get it done with die grinder or drill and rolocs, - most definitely wouldn't be my first choice unless you had limited space. For heads (exhaust /intake) and manifold mating surfaces, if you use a little palm sander w/3m pad, you'll get the surface balanced and uniform right quick w/o question. I used an old 1/4 sheet Makita for prep for years, recently picked up a nice Ridgid 1/4 sheet with variable speed. Both will do a great job, but the variable speed is a huge asset lol.