jigo wrote:
The lateral sewer line from my house to the street clogs about once a
year, in spite of my putting drain cleaner in regularly. The guy who
cleaned it out last time said the line is broken. The town says it's
my responsibility. It would be several thousand dollars to dig up and
repair the line. I've heard one company claim that it can replace the
line without any digging (I suppose by inserting another line through
the old one).

Yes, my town is doing that with their own sewer lines, it does work quite well.

What's the best way to deal with this problem: Have the
line cleaned once a year, get a new line, get a better sewer cleaner,

Unlikely to work with a broken line.

or something else?

Shove new plastic sewer line up the current one.

How practical that is depends on how straight your current sewer is etc.

Any suggestions would be greatly appreciated.