Plugin Still adding watermark even though it is deleted

I installed this plugin and wasn’t very pleased with it. After trying to deactivate and delete this, removing the watermark is definitely not automatic, It will leave traces everywhere and you will need to go into each image and manually remove the watermark.

My problem is that I added automatic watermark on each upload. Now every image is still getting the watermark i want to remove. The images in my media gallery are the originals and when i try to make a new image gallery i upload from media library and after upload, guess what the watermark is appearing.

how can i get rid of it for good. so annoying.