That’s right but it’s the cheapest and the safest way. Getting out and doing all that pruning would be good exercise to though. What I’d do if i were you is prune them right down if you don’t want them and as you do each section pour boiling water on them.The stems are all along that side of the house - that would be a lot of boiling water and salt to put on them.
Even better idea.When you use salt, it's not the table kind of salt, get the rock salt. If you spread the salt now, with all the winter rain and such coming, the roots might be dead or almost dead by spring. Just get some rock salt and spread them along the root area and see how that works.