Hi Beverly!
I hope you find that Disney World is a place where guests with special
requests are treated in the best way possible - this includes requests
for items like extra room cleaning.
First, the best thing to do is plan ahead - be sure to contact Disney to
let them know of your request as soon as you make your reservation (or
during the reservation process). If you'd like to do this online, there
is a
special form that lists "VIP Clean for allergies" that can be used and a Disney representative will contact you. Or, if you prefer, you can call Disney at (407) 934-7639.
You can still use on-line check-in as well, but you should still mention the request to the Cast Members at the resort - just to double check!
Hope this helps! Have a GREAT vacation!