Fix spreadsheet headers
Your column names are on row 4, under the report title and the generated-on line. Drop the file in and it will tell you which row is the header, for free.
What would cleaning your file change?
Free, no signup, no credit charged. Shows every change it would make, and the price, before you buy anything.
This one sends your file. Working out which convention a number column uses means reading every row, which a browser will not do well on a large export. It is read in memory and deleted when the request ends, and nothing cleaned is stored or returned here.