# Infinium workflow how to prepare bleach solution (sodium hypochlorite)

This article reviews how to prepare a bleach solution (sodium hypochlorite) for cleaning Infinium glass back plates and laboratory surfaces and instruments.

[Infinium Assay Best Practices / Daily and Weekly Bleaching](https://support-docs.illumina.com/ARR/InfLabSetup/Content/ARR/SetupandProcedures/BestPractices.htm?Highlight=bleach) recommends to use 10% bleach for cleaning Infinium glass back plates and laboratory surfaces and instruments.

* Bleach is a 5.25% sodium hypochlorite (NaOCl) solution

  ![](https://761066130-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FGM9W2DuBTgEXv1ClCm8H%2Fuploads%2Fgit-blob-eeda5266a289c349fc7751de10cf7ee3353b0bdc%2Fimage1.png?alt=media\&token=f4214175-31f0-4ea0-8754-7dc00d31a5d3)

**Source of table:** [**In­nium Karyomapping Assay Protocol Guide**](https://emea.support.illumina.com/content/dam/illumina-support/documents/documentation/chemistry_documentation/infinium_assays/infinium-karyomapping-assay/infinium-karyomapping-assay-protocol-guide-15052710-02.pdf)**, page 15.** \* A 10% bleach corresponds to 0.525% sodium hypochlorite, which can be approximated as 0.5% for preparations.

**To make 10% bleach solution:**

* Add for example 100 ml of bleach (5.25% sodium hypochlorite ) to 900 ml DI H2O and mix thoroughly.

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