11.   This cleaning method should not be used with older model dishwashers that have a porcelain surface, because citric acid can permanently scratch it, Holt said.

12.   Coca-Cola then announced more stringent cleaning methods for the returnable bottles.

13.   Reports surfaced last year that the British Museum had irreparably damaged the marbles through poor cleaning methods.

14.   Then they are teaching families various cleaning methods as part of studies to see what works.

15.   He said customers should refuse to have their necks shaved if the barber was using the old-fashioned cleaning methods for a razor blade.