But the sales-like nature of this visit put me off could i save more elsewhere? Heats and loosens debris and grease in drains, but is non-flammable and non-explosive. I'll have to think that one over for awhile a very informative blog, as usual, and voted up! Times are displayed in a hour format. A plunger and and bit of arm action! Includes annual boiler service & safety check). Here are a few natural drain cleaner ideas.