The Sword and the...sponge?

The main character is Axel Harch. A 20 year old college student, who also has a job at a Fast food restaurant as a janitor. One day as he was packing up, he noticed a random glowing sponge, he decides to take it, after he left, he was strolling through the park, heading back to his dorm. And then the sponge started glowing up again, and a glowing line from the sponge and a rock connect to each other, when he reaches to it, it appears to be a sword of some type. There was something next to it that basically said "scrub it with the sponge". After he did that, the sword rises up, and reaches into his hand. Then soon after, he is taken to a whole new world, a world of full of janitors and cleaners, and he has been told, that to reach back to his land, he'll need to defeat the evil Lord, Dirty darkness, a demon that makes everything dirty around him. And in the world of cleaners, that's a nightmare, so it would be up to him, to defeat him, save their world, and return to his