carbon dust w/streaks

[Bobs Exterior]

help
i have a 20000 dollar bid but cant seem to remove carbon stains and streaks to my spec.
this is at a rubber plant
any chemicals to remove stains??
3 surfaces working with
1 factory barn steel finnish
2 painted steel finnish
3 enamel gloss on silos 80 ft tall
chem tryed 1 limonene, truck wash, power stroke, and hand brushing it takes about 80% off but streaks embedded in paint help

 

[Paul]

Sounds like a mild acid wash solution might help.

Just a thought....Paul

 

[Glenn]

Try 2 stepping, acid then soap and high pressure rinse.

 

[Larry L.]

<b><font color=green>Bob,carbon enbedded in paint is a nightmare to get all of it out.You'll have to or may have to take a thin layer of paint off to get it all.I have good luck useing DNB1430 or DNB1433 on carbon,if your sure its enbedded the 1430 will cut paint but is more likely to do damage if to strong,it will buddle paint.The 1433 would be more safer to use and does a good job of removing carbon.

Try a different kind of degreaser from the one you tried and add it to your soap mix,some will work better than other on carbon.

What type of paint?,,,baked on,brushed on? what color of paint? these all make a differents when trying to remove enbedded carbon as to how much can can taken off.

 

[jschessler]

soap

Try degreaser, spray on at 50/50 then brush and let sit for about 2 minutes. Don't wait to long or the paint will come off with it.