Prosoco's SureKleen is great for some things, but in this case it's simply not the best product for this particular job. Yeah Zippo those b & a shots are great, but where is the yellow brick in your picture and how does that help Mike with his yellow brick cleaning job? Diedrich 101 and 101G are both great on black encrustation carbon buildup on yellow brick restoration cleanings. We've got a ton of yellow brick properties here in Pittsburgh with heavy carbon encrustation from the old steel mills and my company cleaned a bunch of them with Diedrich. We've got a bunch more coming up this year to do and we're using Diedrich again. Everything from hi-rise apartment buildings to residential homes.
I'm not trying to bad mouth Prosoco, I just don't think they have the best product for this particular application.