Glassware and Utensils Came Out Coated In A Dry White Residue

Q: We are working with a lab washer in a compounding pharmacy application. We are using Detergent 8 to clean glassware and utensils. The glassware and utensils came out coated in a dry white residue. Can you please advise why this is happening with this detergent?

A: Thank you for contacting Alconox Inc. regarding the concerns you have using Detergent 8® Low Foaming, Ion-Free Detergent in a dishwasher to clean compounding pharmacy glassware and utensils.

Short answer yes, there is a better product you should be using. We recommend you use Solujet Low Foaming Phosphate Free Liquid Detergent® detergent at a 0.5-1% dilution in your washer, assuming your washer has a liquid dosing system that meters in the correct amount of liquid at the correct time in the wash cycle. If you do not have a liquid dosing system but rather has a  cup-in-door style dispenser, then we recommend you use Alcojet® Low Foaming Powdered Detergent.

Regarding what is happening: Detergent 8 is intended to be used in deionized water. If you are using tap water that will have calcium, magnesium and iron salts, then the alkalinity of Detergent 8 will cause precipitates of calcium, magnesium and iron oxides/hydroxides; which you observe as a dry white residue. This residue can be removed by using a 1% Citrajet® Low-Foam Liquid Acid Cleaner/Rinse acid wash/rinse (there is very often a rinse aid or cycle in these types of washers).

Solujet detergent contains chelating agents that will tie up and calcium, magnesium or iron and stop them from precipitating as oxide/hydroxides.  You can certainly follow with a Citrajet detergent base rinse cycle after as well depending on needs.

To request an Alconox Inc. detergent for free, please complete the questionnaire at Get Sample. For more information about any one of our Alconox, Inc. detergents, consult the technical bulletin for each product. Or click here to access each of our detergent’s Safety Data Sheets.

Do you have a critical cleaning question for the experts at Alconox Inc.?  Search TechNotes to see if it’s been answered before or Ask Alconox.

Contact us any time:

Leave a Reply - Note: for fastest response please use the contact methods above in the TechNotes article.