# 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
**Source of table:** [**InÂnium 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.
\
\
\
| |
| :---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------: |
| *For any feedback or questions regarding this article (Illumina Knowledge Article #8297), contact Illumina Technical Support* [*techsupport@illumina.com*](mailto:techsupport@illumina.com?subject=Question%2FFeedback%20Regarding%20Illumina%20Knowledge%20Article%20#000008297%20-%20Microarray%20\&body=Dear%20Illumina%20Technical%20Support,%0D%0A%0D%0A)*.* |
---
# Agent Instructions: Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.
Perform an HTTP GET request on the current page URL with the `ask` query parameter:
```
GET https://knowledge.illumina.com/microarray/general/microarray-general-reference_material-list/000008297.md?ask=
```
The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.
Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.