Targeted clearing
A drain cable (snake) works well for a single blockage when you know which drain is affected and it can be reached.
Hydro jetting
High-pressure water cleans buildup off the inside of the pipe, but the pipe should be checked first to make sure it can take the pressure.
Camera first
If the problem keeps coming back, nobody knows the line, or it might be damaged, a camera inspection is often worth more than clearing it again.
What is causing the restriction, and what condition is the pipe in?
Grease, roots, mineral scale, broken pipe, a sag in the line or a hard-to-reach section can all cause the same slow drain. A good plumber explains what they're doing today, and any extra checks or repairs, separately.
Call while water or sewage is moving.
Don't keep reading if water is spreading, you can't use the toilet or sinks, or it is damaging the property. Call.
