The most efficient way to clean those 300 columns isn't a macro at all. It's a single, well-placed formula that tells the spreadsheet to handle every column at once.
Here's what happened: you used Text-to-Columns to split wine varietal names by commas, and it worked, except it left a leading space in every cell from Column C onward. That space came from the original data formatting, not from the split itself. Your instinct to automate was right, but macros can be brittle when you're dealing with hundreds of columns, especially if you're not writing VBA from scratch. The real solution is simpler and more reliable.
Use the TRIM function across the entire range. In a new row or sheet, enter `=TRIM(C1)` and drag it across all 300 columns. TRIM removes leading, trailing, and double spaces without affecting the text itself. Then copy the result and paste it back as values. That's it. No looping, no debugging, no clicking through each column. If you want to do it in place without a helper row, select the entire range from C1 to the end, press Ctrl+H, and replace a single space with nothing, but only if every leading space is truly one space. The TRIM method is safer because it handles inconsistencies.
This is the kind of moment where traditional spreadsheet tools feel like they're fighting you. You have the data you need, but the cleanup work is tedious and error-prone. That friction is exactly what a modern approach should remove. An AI-native spreadsheet would let you say "remove leading spaces from all columns after B" in plain language, and it would execute instantly. You wouldn't need to remember TRIM's syntax or worry about range selection. The tool would understand your intent.
For now, TRIM is your answer. Apply it once, paste as values, and move on to the work that matters, exploring those wine varietals and their names. The point isn't to master macros. It's to know which tool fits the task.