The vaccine, expected by year's end, presumably will be safer because it is developed by a cleaner method.

This is meant to offer a cleaner method of dispensing the product.

He also maintained that the preferred method should be the guillotine, as it was the fastest and cleanest method of execution.

The gains to be made from doing this are that MFCs are a very clean and efficient method of energy production.

Politicians can't always use clean methods.

Looking forward, the driving force in the automobile market will be fuel efficiency and cleaner methods of production.

Only 20% of UK electricity is generated by 'clean' methods such as nuclear power.

Some landlords pressed cleaners to close down or switch to cleaner methods.

The second and last part of the event included lifting weights using the clean and jerk method.

Even the cleanest methods for mining coal and copper create messes.