I did panic a little when I saw that Sanitize was being deprecated. I use 
it in all my models before save to clean inputs of non-HTML data. I even 
extended the Sanitize class to use htmlspecialchars instead of htmlentities 
(have to preserve accented characters, etc.).

Anyway I prefer to sanitize input before being saved as opposed to just 
using h() on output. For non HTML fields I think a viable alternative is to 
use the filter functions in PHP, for example:

http://php.net/manual/en/function.filter-var.php

For HTML input I use the HTML Purifier library as a vendor package and use 
a component to clean the input before saving in the controller. Just 
updated the Brita component that was posted long time ago in the Bakery:

http://bakery.cakephp.org/articles/debuggeddesigns/2008/11/04/brita-component-with-html-purifier

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