Hi joe i had a youth club carpets to clean a couple of years ago that had hard putty on the carpet,
i removed it with a steam gun, but got a call back when it dryed as there was oil marks on the carpet
The oil marks i guess was the linseed oil in the putty,
cleaned the spots with citrus gel rinsed and forced dryed with a hair dryer
job done.
So make sure you dry it before you leave to save going back as i did
