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Met up with business client, ans once again we talk-kok about the price of stuff and how to get the best value for money in things we buy. He operates Toilet cleaning business, and he feels that he need to come up with some method to justify the cost-vs-value on his detergent/soap chemical supplier He feels that although some vendor can sell him cleaning chemicals cheaper, it may be more diluted or less effective in cleaning. For example, its difficult to know the dilution level from the flow of the liquid soap, as the vendor may well add in some thickener chemical to create the 'thick=concentrated' perception. The powder detergent also can add in some flour or powder to dilute its concentration. It won't be easy to discover if the vendor has diluted the detergent by 20%, and then offer the selling price 10% cheaper compared to other competitors. Any chemist out there knows of a measuring meter that can measure soap concentration or cleaning strength? Any comments?