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Spreadsheet Dedup and Cleanup

Example prompt: "Check our 'Contacts' Google Sheet for duplicate entries based on email address. Merge any duplicates by keeping the most recent data, flag rows with missing phone numbers, and send me a Slack message with a summary of what was cleaned up."

How to automate spreadsheet deduplication with GloriaMundo

The Problem

Shared spreadsheets accumulate duplicates and inconsistencies over time. Multiple people add rows without checking what already exists. The same contact appears three times with slightly different spellings. Phone numbers are sometimes formatted with spaces, sometimes without. Some rows are missing fields that were meant to be required. Manually auditing a sheet with hundreds or thousands of rows is mind-numbing work, and it needs doing regularly because the mess keeps growing. Left unchecked, duplicate records lead to embarrassing double-emails, inaccurate reporting, and wasted effort when two people unknowingly work the same lead.

How GloriaMundo Solves It

We build a workflow that reads your entire spreadsheet, identifies problems, and fixes them. An integration step pulls all rows from the Google Sheet. A code step scans for duplicates based on a key field you specify (typically email address or company name), groups matching rows together, and merges them by keeping the most recently updated values for each field. The same code step flags rows with missing required fields. Another integration step writes the cleaned data back to the sheet — duplicates removed, fields consolidated, formatting normalised. A final integration step sends you a Slack summary: how many duplicates were merged, how many incomplete rows were flagged, and a link to the sheet so you can review the changes. Glass Box preview shows you the exact merge and cleanup operations before any data is modified.

Example Workflow Steps

  1. Trigger (scheduled or manual): Runs weekly or on demand.
  2. Step 1 (integration): Read all rows from the 'Contacts' Google Sheet.
  3. Step 2 (code): Identify duplicate rows by email address, merge them by keeping the most recent value for each field, and flag rows missing required fields (phone number, company name).
  4. Step 3 (integration): Write the cleaned and deduplicated data back to the Google Sheet.
  5. Step 4 (integration): Post a summary to Slack — number of duplicates merged, incomplete rows flagged, and a link to the updated sheet.

Integrations Used

  • Google Sheets — source and destination for the contact data being cleaned
  • Slack — receives a summary of the cleanup results so stakeholders know what changed

Who This Is For

Sales ops, marketing teams, and anyone maintaining a shared contact or lead list in Google Sheets. Especially valuable for teams where multiple people add data to the same sheet and there is no formal deduplication process in place.

Time & Cost Saved

Manually auditing a 500-row spreadsheet for duplicates takes roughly 1-2 hours, and most teams put it off until the data quality becomes a visible problem. Running this workflow weekly keeps the sheet clean with no manual effort. Over a quarter, it saves 4-8 hours of tedious audit work and prevents the downstream costs of bad data — duplicate outreach, inaccurate pipeline numbers, and time wasted reconciling conflicting records.