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Jim I have to acknowledge you on this one!!
Never say never guys!! You have to know the conditions upon which to use zero degree nozzles.
Sorry I could not get to this earlier. Carlos I also cannot see my thumbnail photos in the manage attachment section.
The lower photo taken of a dumpster pad area concrete before cleaning, the concrete I estimated is 20 years old, seems very hard. This is oils from the trash truck, not sure what type.
Same machine 8 gpm at 180F no chems,
the surface cleaners different, upper photo,
left side BE Whirl-A-Way 18" 3 arm 0003.0 tips pump head read 3600 psi, (fair amount of flow escaped the swivel weep hole)
2 inches of uncleaned space between (for reference),
Right side 30" mosmatic 3 arm 1503 tips, pump head read 3200 psi.
Both via 200ft of 1/2 hose same machine.
p.s I did not have to crawl with the 18"