MVC 5 - Prevent password storing - asp.net-mvc

Question

I need to prevent the storing of username/password on my MVC 5 site.
I have set the both the form and input elements to autocomplete="off" and I'm sure the site is running HTML5. For all intents and purposes it should not want to store the login information, yet, it still prompts for it after login.
As suggested, I tried changing the input field names to something other than "username" and "password", but it changed nothing.
I have even tried the trick of adding dummy username & password hidden elements outside the form, tried inside the form as well. No joy.
I have also tried doing it in jQuery, with no success
$("input").attr("autocomplete", "off");
Form tag:
<form action="/" autocomplete="off" class="form-horizontal" method="post" role="form" novalidate="novalidate">
input element:
<input autocomplete="off" class="form-control" data-val="true" data-val-regex="Mobile number must be a Numbers only." data-val-regex-pattern="[0-9]*\.?[0-9]+" data-val-required="The Mobile field is required." id="Username" name="Username" type="text" value="">
Tested in IE and chrome, but prompt to save info.
Any help or advice would be greatly appreciated. How do banks prevent this?

Answer 1

I tested many solution and finally, came with this one.
HTML code
#Html.TextBoxFor(m => m.UserName, new { #class = "form-control", #placeholder = "UserName", #autofocus = "", #autocomplete = "off" })
#Html.TextBoxFor(m => m.Password, new { #class = "form-control", #placeholder = "Password", #autocomplete = "off" })
CSS code
#Password {
text-security: disc;
-webkit-text-security: disc;
-moz-text-security: disc;
}
JavaScript code
window.onload = function () {
init();
}
function init() {
var x = document.getElementsByTagName("input")["Password"];
var style = window.getComputedStyle(x);
console.log(style);
if (style.webkitTextSecurity) {
// Do nothing
} else {
x.setAttribute("type", "password");
}
}