Rank Math Generated Sitemap cannot be deleted.

Hi,

I uninstalled Rank Math plugin from my wordpress website just to try an another SEO plugin.I have deactivated & deleted the plugin via admin dashboard of the website following the usual process.But once after the uninstallation process is completed, sitemap generated via Rank Math is still there on my website.I tried following options suggested on your support forum

1. I tried to clear the sitemap cache file via FTP that is located on this path: ..\wp-content\plugins\seo-by-rank-math\sitemap-cache.But there was not such file inside the plugins folder

2. Then I tried to remove the sitemap map by addicting the following code in the themes’ functions.php file & then installed, deactivated, and deleted the plugin.

/**
* Filter to remove Rank Math data from the database
*/
add_filter( ‘rank_math_clear_data_on_uninstall’, ‘__return_true’ );

3. I tried to change & save permalinks in settings menu

But unfortunately nothing worked for me & Rank Math generated sitemap is still there on my website.Please help me to remove the RankMath sitemap from my website.

Thank you.