Caution..!! Your site might face down time until all images are re-cached
Login to your FTP.
Visit public/cache
Delete all file from it.
Visit storage/app/images
Delete all file from it.
Visit your site in browser and refresh it for 10-15 times.
Login to cloud server
Visit cache
folder
Delete all file from it.
Now login to your website FTP account
Visit storage/app/images
Delete all file from it.
Visit your site in browser and refresh it for 10-15 times.