Sales exports
Exports from Apollo, ZoomInfo, and Sales Navigator are prospecting data, not import-ready files. They carry ALL-CAPS names, "Inc" and "LLC" suffixes on company names, job-title clutter, name columns that are either split or joined the wrong way, and CSV quoting errors that make an importer choke on line 1. Whole paid tools exist just to tidy this up. Sift cleans the format for free, in your browser, with nothing uploaded.
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Apollo throws verbatim errors like "Most rows need a valid full name" and "Illegal quoting in line 1" when the file has a single combined name column or unbalanced quotes. Its field mapping is case-sensitive. ZoomInfo warns you to "expect a 15-25% bounce rate on any export" and its own reviews flag "Outdated Contacts". Sales Navigator hands you names in caps and a full name jammed into one column. There is a reason paid cleaners like Evaboot exist solely to strip "Inc." and "LLC" from company names, format job titles, and split full names.
You can do most of this by hand. Proper-case the names with a PROPER() formula, then go back and fix the ones it broke (Mcdonald, mismatched acronyms). Find-and-replace the "Inc" and "LLC" casing. Use Text to Columns to split the full-name column, then clean up every row where it split on the wrong space. Chase the quoting error to whichever row has a rogue comma or quote. Or you pay for a dedicated tool that does the caps, suffixes, and name-splitting for you. Both routes work; both take time, and the formula fixes un-fix themselves the next time the CSV is reopened in Excel.
This is the honest limit. ZoomInfo and similar tools warn of a 15-25% bounce rate because contacts go stale, people change jobs, and mailboxes get deprovisioned. Sift fixes the format of an address, whether "Jane.Doe @Acme.com " is trimmed and cased correctly, but it does not verify deliverability and it does not refresh outdated data. If an address is well-formed but the person left the company, Sift can't know that. For bounce risk, run the cleaned file through an email-verification service before you send. Sift gets the file into shape; a verifier tells you which addresses are still live.