Having cleaned over 24 trailers with Zolotone, the ammonia is the way to go.
Wear a respirator, open all the windows, and use, like G says, a clean rag....
wipe, check rag, wipe, check rag, repeat. Good luck! Also, on the interiors
w/vinyl wall coverings, the ammonia works great, but you can also go with
something less toxic, like a watered down bleach (25% bleach/75% water) or
409....on a good day, just use Simple Green.
Wendy