Take alength of nylon twine feed it down the drain till you can see it come
out. Put a knot at both ends slightly smaller than the i.d. of the tubing.Now
what will happen is that the water will follow the string And wic out. If it
cloges up tie a second length on and just pull out leaving the second length
in place. Repeat as you need to to keep drain lines clear. It is a pain at
first But if you have a pluged drain you are going to get into it any way . I
use nylon because it does not rot and is soft. I also use this for my sun
roof drains. It works!