Here's how to get dreaded wax out of a carpet before your landlord sees it!!
Heat your iron to a temp that won't burn the carpet. Then, place 1 piece of paper towel on top of the wax.
Place iron on top of wax for a few seconds. Don't press too hard on the iron. You won't burn the carpet or towel as long as you pay attention.
The iron heats up the wax that gets absorbed by paper towel. Repeat as often as required. Rotate towel for max. effect.
The more wax, the more paper towel you'll need but this works.