What is the name of the chemical you can pump through drip irrigation to clean the lines and drip emitters?

There are a number of things you can use. You can contact the manufacturer of your kind of drip lines and ask them what they recommend. You can pump in a 3% solution of nitric acid, or a 3% solution of common household bleach (sodium hypochlorite). You can also use a solution of 45% hydrogen peroxide mixed with a little vinegar. Whichever solution you use, remember to flush the system completely with clean, clear water.

The only real product that removes the blockage in emitters is Line Blaster. lineblaster.com It works quickly, won't hurt the plants, and is economical to use.