Not to worry, but sanitizing input literally takes no more than one additional function call (at least for php/ruby/python/perl/nodejs/java/c#/ocaml).

I can understand that this might be a hassle if you've written this app in COBOL, or some other word-heavy language. In which case, my most sincere condolences.

Sanitising input takes one extra function call (or it should, depending on your language of choice), which to write will take about five seconds…so in half an hour, you should be able to sanitise your input 360 times.