Is There an Effective Way to Clean This Aggregate with River Rock?

[MrSparkleVA]

@MrSparkleVA

Went out on a HA lead this morning at 6:30 and found this

:

Will ANYTHING get this stuff clean? I have had my heart broken several times I’ve come up against it. Will heat? Is there a process that will cllean this. I have applied SH before AND after surface cleaning with a 4k 4gmp PW. Does anyone have any advice? @Innocentbystander, what do YOU do when you come upon this stuff with pebbles in the aggregate? How about it @Racer, is there a formula that will clean this crap? @squidskc, Brodie, you (or anyone else) have a solution, or should I just run like h%ll.

SO, these are the after photos: