I'm revamping a website for work. This was the old website of an acquisition, and he likes the look of it (and to his credit, it is a nice looking website). HOWEVER However, this website was done in Adobe Muse, and the CSS/HTML is like a brick of text to go through. There's no rhyme or reason to it. Now he wants me to edit the navbar, and that looks like it will be a nightmare.
He's a technical person, but more so on the hardware side. How do I convince him (I've already told him a couple of times it's disgusting code) that this is a problem? I'm already working on a bootstrap site; however, we let our crappy site sit to long without any updates and now he wants it done fast (hence, revamping the other site). I'm a perfectionist, I can't handle this.