A belt drive is still subject to stretch but operates very quietly, cleanly, and efficiently. It must also start quickly and cleanly. These precursor compounds are produced cleanly and cheaply. Another important aspect of etiquette is simply fighting fairly and cleanly. Some cacti produce "pads" or "joints" that can be detached or cleanly cut off. The fuels that are easiest to burn cleanly are typically liquids and gases. A nice combo upstairs by Bradley but uncertain as to how cleanly it landed. LPG burns more cleanly than higher molecular weight hydrocarbons because it releases fewer particulates. It is often used as a hedge plant, with its small leaves shearing cleanly. This tonsure is renewed as often as required to keep the head cleanly shaven. The mountains of trash are hauled away and the ways cleanly washed down each morning. The narrator is convinced that he got away cleanly and is unconcerned. Natural gas burns more cleanly than other fuels, such as oil and coal. Out came the second start, and all the drivers started cleanly. An implication of one boiling point is that lighter components never cleanly "boil first".