What is the best way to clear a clogged ac drain line - they continually clog up and we cannot afford a service call every time. Also is there a product you can put in the lines to keep the snotty substance from building up so fast?

A watered down bleach mix.

What is the best way to clear a clogged ac drain line

Try using a shop vac on the end where water is supposed to come out,, sometimes you might get lucky