How to How to Use CLEAN Function in Excel in Excel - Practical Guide

Learn how to use the CLEAN function to remove non-printable characters from text data in Excel. This tutorial covers syntax, practical applications, and real-world examples to help you sanitize imported data, fix formatting issues, and prepare text for analysis or reporting.

Why This Matters

The CLEAN function is essential for data hygiene, especially when importing from external sources where hidden characters corrupt formulas and analyses.

Prerequisites

•Basic Excel navigation and cell selection
•Understanding of text data and formula entry
•Familiarity with the formula bar

Step-by-Step Instructions

Open or create a spreadsheet with text data

Launch Excel and open a file containing text with potential non-printable characters, or create a new workbook with sample data.

Click on an empty cell for the result

Select the cell where you want the cleaned text to appear, typically next to your original data.

Enter the CLEAN formula

Type =CLEAN(A1) in the formula bar, replacing A1 with the cell reference containing the text you want to clean.

Press Enter to execute

Press Enter to run the formula; the cleaned text will display in your selected cell without non-printable characters.

Copy the formula down to other cells

Select the cell with the formula, copy it (Ctrl+C), then select your range and paste (Ctrl+V) to clean multiple cells at once.

Alternative Methods

Combine CLEAN with TRIM

Use =TRIM(CLEAN(A1)) to remove both non-printable characters and extra spaces for maximum text cleaning.

Use Find & Replace with regular expressions

Open Find & Replace (Ctrl+H), enable regular expressions in Options, and use patterns to manually remove specific non-printable characters.

Tips & Tricks

✓CLEAN removes the 32 least-printable characters (ASCII codes 0-31) from text data.
✓Use CLEAN when importing data from web sources, databases, or legacy systems where hidden characters are common.
✓Combine CLEAN with other text functions like TRIM, UPPER, or LOWER for comprehensive text formatting.

Pro Tips

★Nest CLEAN inside VALUE when converting cleaned text to numbers: =VALUE(CLEAN(A1)).
★Use CLEAN proactively on imported data immediately after pasting to prevent downstream formula errors.
★Combine CLEAN with SUBSTITUTE to handle specific unwanted characters not removed by CLEAN.

Troubleshooting

Formula returns the same text unchanged

The text may not contain non-printable characters. Verify your source data quality or check for visible spaces and line breaks using the View > Show all Marks option.

CLEAN removes characters I wanted to keep

CLEAN cannot distinguish between intentional and non-printable characters. Use SUBSTITUTE or Find & Replace to manually target specific unwanted characters instead.

Formula displays #NAME? error

Check your Excel language setting; use CLEAN for English versions or NETTOYER for French versions. Verify correct function name spelling.

Related Excel Formulas

TRIM SUBSTITUTE VALUE UPPER LOWER LEN

Frequently Asked Questions

What exactly does CLEAN remove?

CLEAN removes the first 32 non-printable ASCII characters (codes 0-31), including line breaks, tabs, and other control characters that may be hidden in text data imported from external sources.

Can CLEAN remove spaces and punctuation?

No, CLEAN only removes non-printable control characters. To remove extra spaces, use TRIM. To remove punctuation or specific characters, use SUBSTITUTE or FIND & REPLACE.

Should I use CLEAN before or after other text functions?

Generally, use CLEAN first to remove hidden characters, then apply TRIM, UPPER, LOWER, or other formatting functions. For example: =TRIM(CLEAN(A1)).

Does CLEAN work with imported CSV or JSON data?

Yes, CLEAN is especially useful for CSV and JSON imports that often contain non-printable characters. Apply it immediately after pasting to prevent formula errors.