DaveBen said:You don't want to burn soap. There is stuff in washer fluid that would do your engine no good. Water or Methanol would be much better. The idea is to lower the intake airflow's temperature. Methanol does it better than water, but water is cheaper and it works.
Dave
Besides, it may not be a bad thing at all to run some soap mist through the engine every once in a while, like a steam cleaning to keep it all shiny and new inside. Maybe right before oil change???SnowTech.3 said:Most of the cheap -20 degF blue washer fluid is about 30% methanol, 70% water.
You can shake it and see if it sudses or bubbles up - if it doesn't, there's no soap.