No,it is not possible to remove the effects on any edited Photo but you can edit back it to normal appearance using the same application which you had used to edit that pic.
If you didn't clear the project even after you saved it then it is possible to undo all the applied effects.
Indeed once you already save the photo you cant restore it again to its original appearance. Unless you still have the file in photoshop wherein you can continue editing the picture or undo the effects you did. Thats why if you're unsure with the final look dont merge or delete the file so you can edit it again.