How to remove citations from Google Scholar profile?
You can't.

Google Scholar, like everything Google, does not curate the data. It only indexes them and makes them easy to search through. If the citing document is online it'll be counted as a citation. 

Google Scholar citations count, h-index and i-10 index are not accurate if you have quality criteria for what constitute a citation (an most reasonable academics do) and should be interpreted with caution.

There are commercial products that give more meaningful citations count per article or researcher. They are generally available via your institution's library.