Why post-construction destroys unprepared gear
Drywall dust kills vacuum motors in 2-3 jobs if you use a residential machine. You need a HEPA-filter commercial shop vac ($300-$600), specific solvent kits for paint residue ($80-$150), and microfibers that you throw away after each job (do not try to launder construction-contaminated cloths into your residential rotation — you will transfer dust to clean clients).