Polishing paper itself is a highly technical job. So there will be some thorny problems in finding a service company. The most important thing is to see if you can find an equal English peer scholar in the professional field to polish. After all, academic papers are rigorous, profound and creative.
In general, because the language writing level of researchers in most Asian countries can't meet the requirements of some English journals, they are usually pointed out by magazine editors.
For example, "Please ask your English-speaking colleagues to review your manual to make sure it is clear and correct it!" "The editorial quality of this paper should be improved." "English is not clear and concise." And so on.
When encountering such problems, most authors will turn to their friends, including English teachers and friends studying abroad, which will achieve certain results. However, sometimes different majors and limited time for friends affect the polishing quality of papers and slow down the process of smooth publication.