jon,
i've done upholstery cleaning with pressure as high as 250psi with a kleenrite tool. naturally, that was on some cheapo furniture, and waiver signed!!!
as mentioned above, tool type, fabric type, regulator, pump flow, etc...........all come into BIG PLAY!
some as low as 60 is sufficient.
100-150 was the norm for me when i did upholstery
