Business owners of sweaty startups like cleaning and pest control told BI that they love the work, but it's getting harder to grow.iStock; Rebecca Zisser/BI"Sweaty startup" describes business ownership in traditionally blue-collar industries.Sweaty startups are facing challenges from inflation and increased competition.Private equity interest in blue-collar businesses is rising, adding pressure on small operators.Patrick Hocker, 35, never envisioned owning a pest-control company.