PRACTICAL GUIDE

How to Clean a B2B Lead List in 3 Steps

📅 October 2026 • ⏱ 4 min read • By Leedrush Team

Invalid emails, duplicate rows and unscored leads cost SDR teams hours every week. Here's how to clean a list with Leedrush in three steps.

The Problem: Bad Data Kills Pipeline

A typical B2B lead list from a vendor like Apollo, ZoomInfo, or a conference download contains:

  • Invalid emails — outdated domains, typos, addresses that bounce
  • Duplicates — the same person twice, from different sources
  • No quality score — no way to know who to contact first

Loading this raw data into your CRM or sequencing tool means your SDRs spend their day on dead leads.

The Solution: 3-Step Lead Cleaning

Step 1: Upload Your File

Drag and drop your lead file — CSV, Excel or JSON. Leedrush recognises common columns automatically: email, name, company, phone, title, website.

Step 2: Leedrush Checks and Scores Every Row

The file runs in the background and you see its progress live. Every row goes through:

  1. Email check — format first, then deliverability with mails.so
  2. Phone format — numbers are checked and normalised
  3. Deduplication — rows with the same email are left out (and never charged)
  4. Company context — read from each company's own website; with your own Apollo key, also job title, seniority, size and LinkedIn
  5. AI scoring — DeepSeek scores each lead 0–100 against your ideal customer and gives the reason
  6. Hot / Warm / Cold — 75+ is Hot, 50–74 Warm, below 50 Cold; undeliverable emails always stay Cold
  7. Billing — only Hot and Warm leads are charged, and a file never costs more than 500 credits

Step 3: Export or Push the Good Leads

Download the result as CSV, Excel or JSON — all leads or only Hot and Warm — or push Hot and Warm leads to HubSpot, Pipedrive and other connected tools. Every row shows the email status, the score and the reason.

💡 Pro Tip: Start your SDRs on the Hot leads (75+), then work through the Warm ones. Cold leads are free, so keeping them for later costs nothing.

What You Get After Cleaning

  • ✅ Email status on every row — undeliverable addresses flagged before you send
  • ✅ No duplicate emails — repeated rows are left out
  • ✅ Quality scores — prioritize the best leads first
  • ✅ Company context — from each company's website (more with your own Apollo key)
  • ✅ CRM-ready — a clean export, or a direct push to your CRM

Try It Now — 500 Free Credits

Upload your first file and see your scored leads. No credit card required.

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